Flowering

Spring 2023: How It Happened

/ Laura Tuke / Leave a comment

The last few years spring has been unusual and unpredictable, with the effects of climate change changing from month-to-month, year-to-year in Dorset. This year has fitted into this with months switching back and forth between record breaking dry spells or heat waves to rainfall or low temperatures. This is bound to have had an effect on nature and the wildlife around us, which is interesting to explore.

Last year there were trends towards earlier spring events or a slow start to spring and then a speeding up to events in April. I can already suggest that spring this year was slow to start as it gave me the opportunity to really experience spring as it got under way and unfolded in front of me. It will be interesting to see though, if this was the trend for trees, shrubs, flowers, insects and birds alike, if the trend differs to 2022 and how spring shaped up as a whole. Read on to see how my favourite season went this year in all its vibrancy!

Trees

Though in 2022 spring emergence dates for trees had crept earlier than the year before, in 2023 nearly all tree dates were later than 2022, following a more similar trend to 2021 and the proceeding years. Field maple and silver birch both flowered earlier in April, but otherwise ash, horse chestnut, english oak, wild cherry and Norway maple all budburst, unfurled leaves and flowered between 1 and 28 days later from March through to May. The same could be said for the leaves of field maple and silver birch. It was odd to see trees though, lacking their fineries for so long this year!

Flowers

In 2022, flowering times varied between species, but this could be split into half flowering earlier and half later than the year before. This year primroses, cuckooflowers and bluebells in woodland all flowered earlier (4, 2 and 1 day earlier respectively), but flowering trends generally followed a more similar pattern to to those of tree events, occurring later. For snowdrops, lesser celandines, daffodils, stitchwort, cowslips, wood anemones, early purple orchids, wild garlic, oxeye daisies, and hedgerow bluebells this was 1-16 days later between January and June. Interestingly yellow archangel was noticeably absent during its usual flowering time, and instead flowered 36 days later than in 2022 on 17th May, being greatly affected by climate and a great indicator of spring conditions.

Insects

Of 13 species recorded emerging during spring 2022, only 2 did not emerge earlier than the year before: the buff-tailed bumblebee and orange-tip butterfly. For 2023, spring flipped dates back around for insect emergences, with 10 out of 12 recorded species emerging later than the year before. This ranged from 2 days later with the speckled wood butterfly to 46 days later with the red admiral butterfly. The exceptions were peacock and comma butterflies, being recorded 15 and 36 days earlier respectively. This could be due to the colder spring impacting and delaying emergences, for example the brimstone butterfly, a common sign of spring, delayed its emergence until the 3rd of April 2023.

Shrubs

For shrub species recorded in 2022, spring events occurred both earlier and later than in 2021, with no obvious trends. In comparison, spring 2023 showed an obvious trend, with nearly all recorded budburst, first leaf unfurling and flowering for 6 species, occurring later than 2022. The exceptions were dog rose flowering earlier in May and hazel catkins flowering earlier in January. The other spring events took place 3-27 days later from February to May. It was an odd year to see blackthorn flowering 2 weeks later within March and meeting its peak in April, and hawthorn first flowering in May, later than usual.

Birds

There was a split with spring bird events in 2022, with events closer to the start of the season occurring later, and those towards the second half occurring earlier than 2021. For 2023, it seems that the dates of spring bird events were also split, but this time with less clear a trend. Rooks began building nests later and most birds fledged young later, but swallows arrived on the 11th April once again, and blackbirds began singing earlier in February. Some differences in event occurrence can be explained by spring temperatures and weather conditions, whereas some are less easily explained for 2023. It is expected though that the later spring will have an overall effect on bird species through other spring events occurring later.

Conclusion

Spring 2023 varied from month-to-month with weather, temperatures, natural events and vibrancy. As a whole, a general unsettled and cooler time led to spring events occurring later than the year before for many species. The concern is though, that there may be a mismatch between the occurrence of events for different species, such as trees and birds, which could have had a greater impact than currently known. Time will tell what the impact of spring 2023 may be!

Species List

  • 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
  • Comma butterfly (Insect) Polygonia c-album
  • 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
  • Goldfinch (Bird) Carduelis carduelis
  • 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
  • House sparrow (Bird) Passer domesticus
  • Lesser celandine (Flowering Plant) Ficaria verna
  • Meadow brown butterfly (Insect) Maniola jurtina
  • Norway maple (Tree) Acer platanoides
  • Orange-tip butterfly (Insect) Anthocharis cardamines
  • Oxeye daisy (Flowering Plant) Leucanthemum vulgare
  • Painted lady butterfly (Insect) Vanessa cardui
  • Peacock butterfly (Insect) Aglais io
  • Primrose (Flowering Plant) Primula vulgaris
  • Red admiral butterfly (Insect) Vanessa atalanta
  • Red-tailed bumblebee (Insect) Bombus lapidarius
  • 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
  • Starling (Bird) Sturnus vulgaris
  • Swallow (Bird) Hirundo rustica
  • Swift (Bird) Apus apus
  • 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.

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.

25_05_19_Outside

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.

12_04_19_Horseshoe_Wood_Anemone_7

  • 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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