House martin

Spring 2024: How It Happened

/ Laura Tuke / 1 Comment

Over the last few years, it has been noticeable that weather patterns and average temperatures have been changing and highly unpredictable, leading to the seasons, such as spring, varying from month-to-month and year-to-year, especially here in Dorset. For example, last year spring began a wash out, moving to cold and stormy spells, before ending with heat waves. This year was an equally odd series of spring weather events with a cold start to the season, followed by wet weather with northerly winds, and finishing with drier spells. It was on average warmer and wetter, but cold nights continued for a long time, and had a noticeable effect on plant growth patterns being seen.

Spring 2023 encountered trends for later spring events and a slow start to spring, which helped to create a mismatch between species and spring events. With a warmer, wetter winter before spring this year, and often above average spring temperatures, it is likely the trends this year may differ to those of 2023. It will be interesting to see if this has had an effect though, by looking at trends for some tree, shrub, flower, insect and bird species. How will spring 2024 have shaped up? Read on to see how my favourite season unfurled this year!

Trees

During 2023, spring emergence dates for trees showed a trend for on average later dates, ranging from 1 to 28 days later. In 2024 though, the majority of spring tree dates were earlier, as seen with field maple, horse chestnut, english oak, and wild cherry, ranging from 1 to 22 days earlier from March through to May. Alder dates though were fractionally later, as were ash and sycamore flowering, and silver birch and norway maple budburst, but the other events for these species occurred earlier. The on average warmer and wetter weather will most likely be the reason for these trends, allowing trees to get a head start this year.

Flowers

Plants flowering during spring 2023 occurred on average later, varying from 1 to 16 days. During spring 2024 though, flowering has occurred earlier, as was the trend with tree species. For snowdrops, lesser celandines, primroses, greater stitchwort, wood anemones, early purple orchids, wild garlic, yellow archangel, cuckooflowers, oxeye daisies, and bluebells flowering occurred 1 to 32 days earlier between January and May. The exceptions were found with daffodils, flowering 6 days later during February, and cowslips, 4 days later during April. It would be understandable thus to think that the warmer, wetter weather of the start of spring will have had a heavy influence on these events, just like with trees.

Insects

Of 12 species that had the emergence date recorded during spring 2023, the majority emerged later than the year before, ranging from 2 to 46 days later. This year though, spring 2024 saw the occurrence of a 50:50 split for the 10 species that had their emergence date recorded, with some species from 2023 yet to be seen at all, such as painted lady butterflies.

Buff-tailed bumblebees, 7-spotted ladybirds, and orange tip, red admiral, and speckled wood butterflies all emerged earlier this year, ranging from 2 to 46 days earlier. Conversely, queen wasps, and brimstone, peacock, gatekeeper, and small tortoiseshell butterflies all emerged later than 2023, ranging from 8 to 47 days later. Though not complete for all, the split does tend to be due to March to April species emerging earlier this year whereas April to June species emerged later this year. This may be due to April being a cooler, wetter month this year, impacting insect species more greatly than plant species that were already making their advance and were less impacted.

Shrubs

Spring 2023 mainly showed a trend for later shrub budburst, leaf unfurling and flowering, ranging from 3-27 days from March to May. In contrast, for spring 2024, the majority of events for shrubs occurred earlier, ranging from 1 to 53 days earlier from December through to May. These included for blackthorn, dog rose, elder, hawthorn and hazel, with the only later event being for red female hazel flowers being observed. This trend shows similarities to those of trees and spring flowering plants, and would be similarly due to a warmer, wetter winter and start of spring, allowing events to occur earlier and shrubs to get a head start on the season.

Birds

Following on from the last two years (2022 and 2023), the dates of bird events during spring 2024 showed no clear trend, with a split between different species and events. Rooks began building their nests earlier, chiffchaffs and swallows arrived earlier, song thrushes and yellowhammers first sang earlier, and the first wrens fledged earlier. Conversely, blackbirds first sang later, the first blackbirds fledged later, blackcaps, cuckoos and house martins arrived later, and great-spotted woodpeckers drummed later.

Some of these event timing changes will be due to spring temperatures and weather conditions on short term and long term scales. Other reasons are less obvious currently, but the hope is that bird events will still have been timed right with other species to make the most of resources this year.

Conclusion

Spring 2024 was a thoroughly odd season, varying from month-to-month, but feeling like wet weather prevailed more than the normal. In the end it was vibrant and colourful, though missing the traditional spring feeling. This year spring was heavily effected by climatic changes and changes to weather patterns, and this may become typical during the springs to come. It is really hard to predict then how each season will play out, and it will be interesting to see now how all British species cope with such unpredictability as time goes on. Only time will tell!

Species List

  • Alder (Tree) Alnus glutinosa
  • Ash (Tree) Fraxinus excelsior
  • Blackbird (Bird) Turdus merula
  • Blackcap (Bird) Sylvia atricapilla
  • Blackthorn (Shrub) Prunus spinosa
  • Bluebell (Flowering Plant) Hyacinthoides non-scripta
  • Brimstone butterfly (Insect) Gonepteryx rhamni
  • Buff-tailed bumblebee (Insect) Bombus terrestris
  • Chiffchaff (Bird) Phylloscopus collybita
  • Common wasp (Insect) Vespula vulgaris
  • Cowslip (Flowering Plant) Primula veris
  • Cuckoo (Bird) Cuculus canorus
  • Cuckooflower (Flowering Plant) Cardamine pratensis
  • Daffodil (Flowering Plant) Narcissus spp.
  • Dog rose (Shrub) Rosa canina
  • Early purple orchid (Flowering Plant) Orchis mascula
  • Elder (Shrub) Sambucus nigra
  • English oak (Tree) Quercus robur
  • Field maple (Tree) Acer campestre
  • Gatekeeper butterfly (Insect) Pyronia tithonus
  • Greater stitchwort (Flowering Plant) Stellaria holostea
  • Great-spotted woodpecker (Bird) Dendrocopos major
  • Hawthorn (Shrub) Crataegus monogyna
  • Hazel (Shrub) Crataegus monogyna
  • Horse chestnut (Tree) Aesculus hippocastanum
  • House martin (Bird) Delichon urbicum
  • Lesser celandine (Flowering Plant) Ficaria verna
  • Norway maple (Tree) Acer platanoides
  • Orange-tip butterfly (Insect) Anthocharis cardamines
  • Oxeye daisy (Flowering Plant) Leucanthemum vulgare
  • Peacock butterfly (Insect) Aglais io
  • Primrose (Flowering Plant) Primula vulgaris
  • Red admiral butterfly (Insect) Vanessa atalanta
  • Rook (Bird) Corvus frugilegus
  • Seven-spot ladybird (Insect) Coccinella septempunctata)
  • Silver birch (Tree) Betula pendula
  • Small tortoiseshell butterfly (Insect) Aglais urticae
  • Snowdrop (Flowering Plant) Galanthus spp.
  • Song thrush (Bird) Turdus philomelos
  • Speckled wood butterfly (Insect) Pararge aegeria
  • Swallow (Bird) Hirundo rustica
  • Sycamore (Tree) Acer pseudoplatanus
  • Wild cherry (Tree) Prunus avium
  • Wild garlic (Flowering Plant) Allium ursinum
  • Wood anemone (Flowering Plant) Anemone nemorosa
  • Wren (Bird) Troglodytes troglodytes
  • Yellow archangel (Flowering Plant) Lamium galeobdolon
  • Yellowhammer (Bird) Emberiza citrinella

Spring 2021: How It Happened

/ Laura Tuke / Leave a comment

This spring has been an unexpected, unpredictable and turbulent season, that has taken its time to unfurl. Traditionally spring is a season that is characterised as calm and dry, with days getting longer and warmer, and the potential for cooler nights. As lighter evenings returned this year though, spring was far from traditional, with a stormy then hot March, cold and frosty April, and a wash out of a May.

Since 2017, I have recorded the dates of the events of spring every year, and with the start of my blog, every year since I have analysed and compared spring events to see how the season took form. Last year I showed that the timing of spring events is heavily linked to spring weather, resulting in either earlier or later occurrence accordingly. Over the last couple of years this has varied alot, so it will be interesting to see what has gone on this year.

This spring a lot has been going on for me, but I have still found time to be out in nature as much as possible and to enjoy the time when one season slips into another. It has felt that spring has dragged on longer this year, with the potential effects of spring starting warm and progressing to cold, then wet. So as this spring comes to a gradual close and the heat sets in, it is time to find out what actually went on during spring 2021.

Trees

This year there was a general trend for trees being later in their bud burst, leaves unfurling, and flowering compared to 2020. Even before the frosty nights of April, silver birch (Betula pendula) buds burst 14 days later on 26th March, Norway maple (Acer platanoides) first flowered 5 days later on 26th March, and beech (Fagus sylvatica) buds burst 14 days later on 27th March.

As we moved through April and into May, spring events began to stretch even further in their lateness. For example, wild cherry (Prunus avium) buds burst 35 days later on 8th April, horse chestnut (Aesculus hippocastanum) first flowered 18 days later on 20th April, alder (Alnus glutinosa) buds burst 15 days later on 21st April, the first lime (Tilia x europaea) leaves unfurled 23 days later on 26th April, pedunculate/english oak (Quercus robur) leaves first unfurled 31 days later on 5th May, and ash (Fraxinus excelsior) flowered 37 days later on 9th May.

Field maple (Acer campestre) did not follow this trend though, with bud burst being 10 days earlier on 26th March, and first leaves unfurling 5 days earlier on 1st April. This may be as these trees missed the worst of the spring weather, but for the other trees spring events ranged from being 1 to 37 days late!

Shrubs

For a lot of the shrub species I monitored a similar trend was shown as with tree species, being later compared to 2020. For example, elder (Sambucus nigra) leaves first unfurled 34 days later on 18th March, blackthorn (Prunus spinosa) first flowered 17 days later on 23rd March, and hawthorn (Crataegus monogyna) first flowered 23 days later on 11th May.

Though half of the shrubs I monitored were later in their spring events, ranging anywhere from 2-34 days later, two species did not completely fit this trend. For lilac (Syringa vulgaris) bud burst occurred 12 days earlier on 24th February, but flowered 17 days later on 2nd May. This was the same for dog rose (Rosa canina), where buds burst 12 days earlier on 22nd February, but first flowered 22 days later on 8th June. For both of these species though, it is the spring events occurring before April that are earlier, as the ones occurring in April and May were not immune to the frosts and heavy rainfall like the other shrubs.

Flowers

For many of our commonly associated spring flower species, there was a little more of a split between appearing earlier or later, but on average they flowered later compared to 2020. Snowdrops (Galanthus spp.) first flowered 15 days later on 18th January, wood anemones (Anemone nemorosa) 8 days later on 30th March, bluebells (Hyacinthoides non-scripta) and greater stitchwort (Stellaria holostea) both 4 days later on 1st April, cowslips (Primula veris) 12 days later on 2nd April, early purple orchid (Orchis mascula) 12 days later on 18th April, wild garlic (Allium ursinum) 14 days later on 20th April, and oxeye daisy (Leucanthemum vulgare) 16 days later on 3rd June.

The exceptions were a section of earlier flowering species, including primrose (Primula vulgaris) first flowering 27 days earlier on 31st December, lesser celandine (Ficaria verna) 3 days earlier on 15th January, daffodil (Narcissus spp.) 22 days earlier on 19th January, and cuckooflower (Cardamine pratensis) 10 days earlier on 8th April. These flowers would have been influenced by a warmer winter and start to spring, generally flowering before the cold spell in April.

Birds

On average, bird species spring events have also become later this year compared to 2020. I heard my first song thrush (Turdus philomelos) singing 17 days later on 1st January, I saw my first rook (Corvus frugilegus) nests being built 10 days later on 25th February, and I heard my first chiffchaff (Phylloscopus collybita) on 16th March. April and May events were again influenced, for example I saw my first swallow (Hirundo rustica) 5 days later on 10th April, saw my first house martin (Delichon urbicum) 9 days later on 21st April, heard my first cuckoo (Cuculus canorus) 3 days later on 1st May, and saw my first swift (Apus apus) 10 days later on 16th May.

There were two exceptions though, where I recorded hearing my first blackbird (Turdus merula) singing 13 days earlier on 10th February, and saw my first blackcap (Sylvia atricapilla) 8 days earlier on 14th April. These would most likely relate to other influencing factors, such as overwintering in the UK or habitat requirements.

Insects

Compared to previous years, I have still yet to see some species of butterfly that would typically be on the wing by now, such as gatekeeper butterflies (Pyronia tithonus). For the insects I have seen though, again there was a split in event occurrence compared to 2020. For example, I saw my first small tortoiseshell butterfly (Aglais urticae) 2 days later on 7th April, red admiral butterfly (Vanessa atalanta) 26 days later on 7th April, brimstone butterfly (Gonepteryx rhamni) 26 days later on 18th April, and speckled wood butterfly (Pararge aegeria) 52 days later on 13th June.

The early emergers came in the form of my first buff-tailed bumblebee (Bombus terrestris) 14 days earlier on 27th February, peacock butterfly (Aglais io) 5 days earlier on 30th March, orange-tip butterfly (Anthocharis cardamines) 13 days earlier on 31st March, and red-tailed bumblebee (Bombus lapidarius) 12 days earlier on 19th April. Despite these species appearing earlier in spring, later flowering plants will have had a knock-on effect for them due to a mismatch in timing for food. Only further down the line will we be able to see the extent of this impact.

Summary

This year I have recorded more spring dates than I have done so before, such as alder trees flowering, first yellowhammer singing, and first green-veined white butterfly, which will be useful information during the years to come. This reflects how I have felt more in touch with nature this year even with the unusual weather patterns, such as alot of rain! It became clear as we went through May though, that there was a trend for events happening later and later. This is why I was so interested to see how far this trend actually extended amongst species.

Last year I wrote that spring events are ‘in fact getting later, which will be related to… weather and environmental factors here and further afield’. This year this has turned out to be the case, which shows how climate change is having more of an impact through changes in weather patterns rather than just warmer temperatures. Earlier spring events have been getting earlier with warmer winters, but heavy rainfall and colder starts to spring have been affecting late March to May events most. I wonder now what impact this might have as we move forward, for example greater mismatches in ecological timings.

Spring 2020: How It Happened

/ Laura Tuke / Leave a comment

Walking through the trees, in dappled early morning sunlight, through swathes of brilliant blue. Standing rooted to the spot, hearing the first Chiffchaff, Swallow, Cuckoo. Sitting in breezy sunshine, learning to identify Hawkbits, Vetches and Viper’s-Bugloss. These are just some of the highlights of my spring this year, wild and full of life. With each new day, there was a new wild highlight to be had.

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Following on from my post last week about my favourite photos from this spring (check out Spring 2020: In Photos), I wanted to continue celebrating the lifeline that has been spring and the natural world for me during lockdown. This week I am looking at how spring unfolded this year in my local area and how it looked now the summer is hitting our shores.

Since 2015 I have been writing down a lot of my observations about spring each year. This means I can now look at spring 2020 in light of how the last few years have actually looked and see if anything interesting comes up. Last year I did this in more detail, so for that check out my post called: How Spring Happened 2017-2019.

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So, did a favourite of my mum’s, the Chiffchaff, return by Mother’s Day this year? Did the Oak burst into leaf before the Ash (and so are we in for a splash)? And did the song of the Cuckoo return to my family’s land for another year? As spring now slips into summer, it is time for me to reflect on an extra special spring.

Trees

One of the very first trees to start showing signs of life each spring at my home in Dorset, is the Horse Chestnut (Aesculus hippocastanum). This year the first buds burst on the 18th of February, which shows a gradual shift forwards over the last few years, being 6 days earlier than last year, and a month earlier than 2018. The first leaf then unfurled on the 10th of March (9 days later than 2019), followed by the first flowers on the 2nd of April (13 days earlier than 2019).

Due to a cold start to spring and a very wet winter, which left the ground cold and waterlogged, Pedunculate (English) Oaks (Quercus robur) were late to make a start, with the first budburst seen on the 2nd of April, 37 days later than 2019. They got going quickly though, with leaves bursting forth by the 8th of April (4 days earlier than 2019) and flowers blooming by the 12th of April (13 days earlier than 2019).

Despite the ground, the trend this year was towards earlier budburst, first leaves and first flowers. Silver Birch (Betula pendula) buds burst on the 15th March, 15 days earlier than 2019; Ash (Fraxinus excelsior) flowered on the 2nd of April, 18 days earlier than 2019; Field Maple (Acer campestre) buds burst on the 5th of April, 13 days earlier than 2019. Grey Willow (Salix cinerea) bucked the trend though, first flowering on the 24th of February, later than last year by 10 days.

This year I added Alder (Alnus glutinosa), Beech (Fagus sylvatica), Lime (Tilia x europaea), Wild Cherry (Prunus avium), and Norway Maple (Acer platanoides) to my spring records, but I did not make observations for Sycamore as in previous years. Lime buds burst on the 14th of March, followed by the first leaf on the 3rd of April; Wild Cherry buds burst on the 15th of March, followed by the first leaf 1 month later and first flower 15 days after that; Norway Maple first flowered on the 21st of March; Alder buds burst on the 6th of April; and Beech buds burst on the 10th of April.

Shrubs

Hazel (Corylus avellana) is one species that flowers early in the year, providing a first hint of colour in a wintry landscape. This year I first saw the male catkins on the 8th of January, followed by the female red flowers on the 1st of February (5 days later than 2019). The first hazel leaf then unfurled 43 days later on the 14th of March.

Blackthorn (Prunus spinosa) is another species that flowers before it produces its leaves, cloaking hedgerows in drifts of snowy white and accompanying a ‘blackthorn winter’ in early spring. This year the first flowers burst open on the 6th of March, 5 days later than last year, but 24 days earlier than 2018.

After the early flowering species have brought colour to our countryside, Hawthorn (Crataegus monogyna) is one of the first shrubs to burst into leaf in the hedgerows. This year its buds first burst on the 2nd of March, 5 days later than 2019, followed by the first leaf unfurling 10 days after (28 days earlier than 2019). Their flowers then followed a month after, on the 18th of April, 10 days earlier than 2019.

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A similar trend was shown with Lilac (Syringa vulgaris), where budburst took place on the 8th of March, 13 days later than 2019. The first leaf then unfurled 3 days later too, on the 25th of March, and the first flowers bloomed on the 15th of April, 7 days earlier than 2019.

The flowers of Elder (Sambucus nigra) are well known and iconic in our countryside, popular for making elderflower cordial. This year Elder flowered early, with the first flowers being seen at home on the 25th of April (22 days earlier than 2019). Just like Elder, the Dog Rose (Rosa canina) is another late bloomer, which opened its petals for the first time on the 17th of May this year (11 days earlier than last year).

Flowers 

The very first flowers to be seen blooming in the countryside is the dainty snow white Snowdrop (Galanthus spp.). Over the last few years the drooping heads of snowdrops have been flowering earlier each year. This year though, it appeared only 1 day earlier than 2019, welcoming in the year on the 3rd of January.

Snowdrops were soon followed by other iconic spring species, in the form of the first Lesser Celandine (Ficaria verna) on the 18th of January (44 days earlier than 2019), the first Primrose (Primula vulgaris) on the 27th of January (8 days earlier than 2019), and the first Daffodils (Narcissus spp.); on the 2nd of February (the same day as last year!).

As spring went on, the Snowdrops and sunshine yellows were joined by Wood Anemones (Anemone nemorosa) on the 22nd of March, Bluebells (Hyacinthoides non-scripta) on the 28th of March, Wild Garlic (Allium ursinum) on the 6th of April, Cuckooflowers (Cardamine pratensis) on the 18th of April, and Oxeye Daisies (Leucanthemum vulgare) on the 18th of May, all occurring 6-17 days earlier than last year.

This year I also included three new flowering species to my spring records: Cowslips (Primula veris), Greater Stitchwort (Stellaria holostea), and Early Purple Orchids (Orchis mascula). I saw the first Cowslip flower on the 20th of March, the first Greater Stitchwort on the 28th of March, and the first Early Purple Orchid on the 6th of April.

Grasses

This year I was so busy in May and the first half of June that I completely overlooked the flowering of 3 common perennial grass species in my local area: Cock’s-foot (Dactylis glomerata), Timothy (Phleum pratense), and Yorkshire Fog (Holcus lanatus). I did though catch Meadow Foxtail (Alopecurus pratensis) flowering, which first occurred on the 22nd of April (23 days earlier than 2019).

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Birds

With the start of every new year, I begin to keep my eye out for the start of the Rooks (Corvus frugilegus) nesting in the bare and skeletal forms of large oak trees near my home. This year they kept me waiting awhile though, with the first signs of nest building appearing on the 15th of February, 17 days later than 2019.

Unlike the start of the Rooks nesting though, the start of male Song Thrushes (Turdus philomelos) singing crept even earlier than last spring. This was 13 days earlier in fact, with me hearing my first on the 15th of December in 2019! This was not reflected by Blackbirds (Turdus merula) though, as I heard my first male singing on the 23rd of February, 17 days later than 2019.

One of my favourite first signs that spring has begun has to be the return of the Chiffchaff (Phylloscopus collybita). This year they returned to my home in Dorset on the 1st of March, 17 days earlier than 2019.

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The glorious return of the Chiffchaffs were then eagerly followed by the first Swallow (Hirundo rustica) on the 5th of April (1 day later than 2019), the first House Martin (Delichon urbicum) on the 12th of April (12 days earlier than 2019), the first Blackcap (Sylvia atricapilla) on the 22nd of April (11 days later than 2018), and the first Swift (Apus apus) on the 6th of May (19 days earlier than 2018). A Cuckoo (Cuculus canorus) did make its exciting return to my family’s land too, which I heard for the first time on the 28th of April (24 days earlier than last year).

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Insects 

This year the majority of the insects I observed, emerged later than they did last year in 2019. I saw my first Brimstone Butterfly (Gonepteryx rhamni) on the 24th of March, my first Peacock Butterfly (Aglais io) on the 4th of April, my first Small Tortoiseshell Butterfly (Aglais urticae) on the 5th of April, my first Orange-Tip Butterfly (Anthocharis cardamines) on the 13th of April, my first Red-Tailed Bumblebee (Bombus lapidarius) on the 1st of May, and my first queen Wasp (Vespula vulgaris) on the 7th of May, with all ranging anywhere between 4 and 37 days later in date than last year.

The ones that did not follow this pattern though, were the Speckled Wood Butterfly (Pararge aegeria) first seen on the same day as last year on the 22nd of April, and the Red Admiral Butterfly (Vanessa atalanta) that was first seen 29 days earlier on the 22nd of April. This year I also added Buff-Tailed Bumblebee (Bombus terrestris) to my observations, seeing the first at home on the 13th of March.

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This Year

This year it has definitely been an interesting and joyful experience to watch how spring unfolded. It started with early signs during the winter, before arriving with a blaze of glory in March.

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This last winter was a warm, wet and windy one, which left the ground cold and waterlogged for quite a while into spring. A number of species such as Oak trees struggled with this, but for many it did not stop them from emerging on time or earlier, such as snowdrops and field maples. This variation continued with bird species, some arriving and beginning breeding earlier and some later. For a lot of the insect species though, they emerged late, which will have had a lot to do with the less than ideal weather conditions this spring, for example frosts in April. Thus, how spring is changing year-to-year definitely has a lot to do with changing weather conditions.

So as spring fades to summer heat, I can now say that the Chiffchaff made its return to the British Isles by Mother’s Day, the Oak burst into leaf before the Ash (and so we are in for a splash!), and a Cuckoo made its return to my home. It has definitely been a great spring this year!

How spring happened 2017-2019

/ Laura Tuke / Leave a comment

Over the last few years, I have taken part in recording how spring has unfurled at my home in Dorset, for a citizen science scheme. As at the end of each spring I upload my results to an online site, in 2017 I decided that I should be writing my observations down for myself in my wildlife journal, making it easy to look back on them in the future.

Now I have recorded dates for many different wildlife spring events, from trees coming into leaf to the return of migrants, for 2017, 2018, and 2019. So here, I want to take a moment to look back at these and reflect on what they may show about spring and its current emergence, and if there is anything interesting we can take from this.

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Trees

In my local area, you can find a large variety of native and non-native tree species. Over the last 3 years, I have consistently made observations for 5 tree species: ash, sycamore, horse chestnut, pedunculate oak and silver birch.

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For the 5 tree species, some similar patterns can be observed from my recorded spring dates for the last 3 years. In 2018, a colder winter was experienced, with heavy snowfalls taking place in January, February and March. Evidently this had an effect on the timing of budburst, first leaf and first flowering for tree species, in comparison to the year before.

Budburst was 36 days later for ash trees (27/04/18), 10 days later for sycamore trees (08/04/18), 19 days later for horse chestnut trees (20/03/18), 21 days later for oak trees (18/04/18), and 26 days later for silver birch trees (12/04/18). The same amount of lateness was also seen with the first leaf and first flowering for these tree species in 2018.

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Due to the weather of spring 2018, this meant that when looking at how this year’s spring unfurled (2019) in comparison to last year, predictably budburst, first leaf and first flowering took place 4-53 days earlier than 2018. When comparing 2019 with 2017 though, I am able to get an idea of the average trend for the three years. For example, ash and silver birch events are getting later, as are horse chestnut flowering and sycamore first leaf. Sycamore, horse chestnut and oak generally show a trend though of spring events getting earlier, from a couple of days to a month.

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Shrubs

For shrubs, the selection I have been observing during spring each year are: blackthorn, dog rose, elder, hawthorn and lilac. From 2017-2019, a similar trend was predominantly observed in these species as with tree species.

In comparison to 2017, blackthorn first flowering was 14 days later in 2018 (30/03/18), elder budburst was 9 days later (13/03/18), elder first leaf was 23 days later (30/03/18) , hawthorn budburst was 33 days later (02/04/18), hawthorn first leaf was 6 days later (08/04/18), and lilac first flowering was 27 days later (07/05/18).

Then when looking at 2019, spring dates were earlier in comparison to 2018, with blackthorn budburst, first leaf and first flowering being 20, 9 and 29 days earlier, dog rose budburst, first leaf and first flowering being 22 and 29 days earlier, elder budburst, first leaf and first flowering being 9, 24 and 8 days earlier, hawthorn budburst and first flowering being 36 and 13 days earlier, and lilac first flowering being 14 days earlier.

Also, similarly to tree species, blackthorn and elder both showed that from 2017 to 2019 spring events have become earlier on average. Hawthorn and lilac showed the opposite trend though, with hawthorn first leaf and first flowering becoming later over the 3 years on average, if only by 7-13 days.

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Flowers 

In comparing spring between 2017, 2018 and 2019, it is evident that for many plant species the same trends have been shown from year to year. This is not true for all though, as between bluebells, cuckooflowers, lesser celandines, oxeye daisies, snowdrops and wood anemones, flowering times varied from being later in 2018 and earlier in 2019, to being earlier overall, or being similar overall.

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  • Bluebells flowered 17 days later in 2018 (13/04/18) than 2017, and then 10 days earlier in 2019 compared to 2018. From 2017 to 2019, this was 7 days later overall.

  • Cuckooflowers flowered 16 days later in 2018 (20/04/18) than 2017, and then 12 days earlier in 2019 compared to 2018. From 2017 to 2019, this was 4 days later overall.
  • Lesser celandines flowered 5 days earlier from 2017 to 2018 (24/02/18), followed by another 13 days earlier in 2019.

  • Snowdrops flowered 10 days earlier from 2017 to 2018 (10/01/18), followed by another 7 days earlier in 2019.
  • Wood anemones flowered around a similar date at the beginning of March each year.

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  • Oxeye daisies flowered around a similar date at the end of May each year.

Grasses

Grass species also showed a differing trend to tree and shrub species for 2017-2019, with a united pattern of flowering later each year. When observing spring events with grasses, I observe from year to year 4 species: cocksfoot, meadow foxtail, timothy, and yorkshire fog.

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Only timothy had observations made for 2017, and so in comparing with 2018, it was found to have flowered 18 days later (18/05/18). This is in line with comparisons between 2018 and 2019, where it was found that cocksfoot flowered 4 days later (30/05/19), meadow foxtail flowered 14 days later (15/05/19), timothy flowered 23 days later (10/06/19), and yorkshire fog flowered 14 days later (12/06/19).

Birds

Though I have started increasing my recordings of different bird species during spring, I only have records for 2+ years for rooks, blackcaps, chiffchaffs, house martins, song thrushes, cuckoos, and swallows.

  • Following the first snowfall of the year, rooks were first seen to be nest building 16 days earlier in 2018 (04/02/18) than 2017, but with no snow, this was 11 days later in 2019.
  • Blackcaps returned to my local area 12 days later in 2018 (11/04/18) than 2017.
  • Chiffchaffs returned 13 days later in 2018 (26/03/18) than 2017, following the last of the snow and cold weather. Consequently, in 2019 they returned 8 days earlier than 2019 (15/02/19), closer to the 2017 date.
  • House martins returned 12 days later in 2018 (25/05/18) than 2017, whilst being 31 days earlier in 2019 than 2018.
  • Male song thrushes were first heard singing in 2018 on 28/01/18, 8 days earlier than 2017. In 2019, this occurred a lot earlier though, 30 days earlier, falling on 29/12/18.
  • Male cuckoo heard calling at a similar time at the end of May in 2018 and 2019.
  • Swallows returned to my local area at a similar time at the end of March/beginning of April in 2017, 2018 and 2019.

Insects

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In line with tree and shrub species, the first sightings recorded each spring of insects followed a general pattern of emerging later in 2018 than 2017, and earlier in 2019 than 2018. This was true for:

  • Brimstone butterflies – 13 days later on 14th April 2018 and 47 days earlier on 26th February 2019
  • Peacock butterflies – 14 days later on 20th April 2018 and 26 days earlier on 25th March 2019
  • Small tortoiseshell butterflies – 31 days later on 26th April 2018 and 25 days earlier on 1st April 2019
  • Speckled wood butterflies – 20 days later on 26th April 2018 and 4 days earlier on 22nd April 2019
  • Orange tip butterflies – 28 days later on 4th May 2018 and 33 days earlier on 1st April 2019
  • Red admiral butterflies – 27 days earlier on 22nd April 2019 
  • 7-spot ladybirds – 19 days later on 25th April 2018
  • Queen wasps – 47 days earlier on 31st March 2019
  • Red-tailed bumblebees – 13 days earlier on 21st April 2019

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Summary

With my love of spring, each year I have enjoyed recording the dates of when things happen during spring, such as the first swallow, first leaf or first elder flower. It has been satisfying now to be able to take a moment to put a few of my records together and take a look at how spring has unfurled over the last few years and what this could mean.

For some species, events are getting earlier, probably due to warmer temperatures earlier on in the year and during the winter before. For others, they are in fact getting later, which will be related to other weather and environmental factors here and further afield. Either way, the ‘norm’ is changing and it will be interesting to see how this could progress over the next few years to come.

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