Three words we always relish on the National weather forecasts.
Sunrises with distant, dense cloud banks, smothering the Eastern, and Southern horizon hills. And overhead the blue, blue skies of home.
The weather has picked up, the days are rapidly lengthening, and 5 days ago a high pressure system, drifted across the UK from Scandinavia. So, I finally managed to see and photograph both bumblebees and honeybees in the garden, one of the great spring markers, on March 10th.
We’d been kept going and cheered, not just by all the spring flowers, but also by that sublime early season songster, the mistle thrush, Turdus viscivorus, which always chooses a prominent tall tree around the property to try out it’s repertoire in repeated phrases, 3 or 4 times, before moving on. Its range is enormous, and it can easily keep it up, almost none stop for 15 to 20 minutes at a stretch.
Orange gape-speakered dawn, dusk and midday rural muzak, though perhaps operetta, would be a more fitting noun.
On a calm day the clear tones travel huge distances, particularly if it’s facing you. But they’re understandably quite wary of close approach, having telegraphed their location so clearly to potential predators, so the photo above is with the camcorder’s 30X zoom, and lacking real clarity. Such a shame I can’t easily upload the video clip – a brilliant stress busting 4 minutes to enjoy, of beautifully clear song.
The general lack of sunshine (and bees) in February and early March has presented very few occasions on which even I, have been able to pollinate Crocus flowers. This should have meant that the display lasted a little longer than most years. But this wasn’t the case, the terrace display of C. tommasinianus fizzling out, just as I expected it to improve. I then got up close, to study the individual Crocus plants, and noticed the tell tale signs of rabbit and mouse, vole, perhaps even rat, damage. And that all we’re left with here are the flowers of the sterile cultivar, C.t. “Ruby Giant”, above. The other planted forms of C.t.“Whitewell’s Purple” and C.t.“Barr’s Purple”, together with my seed grown forms, have almost no flowers remaining.
Rabbits are pretty unselective, and graze off both leaves and flowers – not so good for Crocus performance next year, but typically take out those which are easiest to access, such as beside the path along our daffodil walk. My strategy now is to plant individual snowdrops, which are unpalatable, amidst such easy to access, Crocus clumps.
By contrast, rodents seem to be much more particular, and take the flower off at the top of the pistil (stem) just beneath the petals’ (or more correctly tepals’) base. Too late in the year, (i.e. last night!) I realised that I could try to photograph such nocturnal mayhem, but this may have to wait until next year.
I do however have a daytime image from my very first blog post of a vole attacking the flowers in 2011, so I’m revisiting old territory. Click here. This year, I started to become aware that the flowers didn’t seem to be taken by the rodents until I’d been round with my pollinating brush. If that is the case, it would perhaps preclude the possibility that the rodents were after either pollen or nectar – wouldn’t they then have taken flowers out earlier?
This might just be a coincidental observation. Maybe the conditions in which I can wield my brush – slightly warmer, and sunnier – actually boost nectar secretion, or pollen release by the anthers? But surely such a boost would be temporary as flowers closed, and cloud or cold returned?
But there were several clumps of Crocus forms unique to Gelli, in that they were the result of me scattering saved, and probably even hand pollinated, seed a few years earlier, which within 48 hours of my pollination, had nearly all their flowers eaten off.
This could be viewed in two ways. Firstly, a natural form of dead heading, which by avoiding any potential for seed formation should allow the plants to put more energy into new corms and flower buds for next year, so producing an even better display in 2017.
Or secondly, extremely frustrating because my pollinating efforts will have been in vain, since no seed will be formed. Our variants on Crocus chrysanthus “Snow Bunting”, never seem to suffer in the same way from rodent flower predation, and the flowers just fade gracefully, leaving a long term, en masse display. They anyway set very few seeds eventually, regardless of my, or natural, pollinator efforts.
But does seed formation actually suffer after such flower predation? As I discovered in my very first blog, in the Crocus flower, the ovary, developing ovules and subsequently seeds, are located below ground level. So the question is how long does it take the pollen grain to germinate, grow down the flower’s longish pistil, and achieve successful fertilisation?
Things now become a bit murky. Whilst I discovered that in maize plants, a pollen grain can germinate and extend its pollen tube by a foot within 24 hours, I couldn’t track this information down for Crocus flowers. Although the distance to be travelled to reach the Crocus ovary is much shorter than in maize, the temperatures are much lower at this time of the year, so one might expect slower growth. (The flower below is a gorgeous rose pink – another result of seed saving from hand pollination efforts).
But what about about the nipping off of the top section of a partially growing pollen tube? Will this ‘kill’ the structure, and prevent it ever reaching its destination? Again I couldn’t find an answer, though it’s presumably known.
But I did find some more fascinating information on pollen.
Firstly, the very formation and release of pollen grains from within the developing anther involves a complex sequence of co-ordinated cellular changes, including the concept of programmed cell death, to allow anther splitting or dehiscence. Click here for some electronmicrographs on anther structure, and more.
Secondly, pollen grains from insect pollinated, or entomophilous, flowers are coated with a special substance known as pollenkitt. What an interesting word! This seems to have lots of potential properties, but in particular, makes the pollen grains stickier and more likely to cling onto the hairy body of a visiting insect. Apparently the most useful pollen, from the flowers’ point of view, is not that which honey and bumblebees collect onto their leg pollen baskets, or corbiculae, but rather the loose grains sticking to body hair.
Thirdly, when pollen gets transferred onto the tip of the stigma, in flowers that are self- incompatible, the grain can be recognised as coming from the same flower, and pollen tube growth is very quickly inhibited. If it’s from a different flower, germination of the pollen tube is encouraged. How sophisticated.
Then, a host of biochemical changes encourage and direct the pollen tube’s growth down the pistil, to guide the tip of the tube towards the ovary (below ground, in the Crocus), rather than wandering around aimlessly in its growth, and never getting anywhere near the ovary. The biochemistry involved in this, is now quite well understood, and, not surprisingly, amazingly complex.
But two factors are critical. Firstly, at the very growing tip of the pollen tube, there is a dramatically increased concentration of Calcium ions which gives a directional cue to its growth. Secondly, actin filaments and myosin motors control the tip’s growth.
This was real news to me, since I remember from years before, that these compounds are vital components of animal’s muscle fibres. Maybe the voles are after a pseudo carnivorous fix, rather than a mere vegetarian hit? The modified image below hints at all this complexity. (From a review article by Alexander Krichevskya, Stanislav V. Kozlovskya, Guo-Wei Tianb, Min-Huei Chena, Adi Zaltsmana, Vitaly Citovskya – Click here for more from this paper), and here for more on actin (and myosin).
Behind this rapidly lengthening pollen tube tip, something else really interesting is happening. Two separate sperm cells, or gametes, are tracking down this elongating tube, just behind the tip. When the pollen tube tip eventually reaches the ovary, one of these sperm cells fuses with an egg cell to form the embryo seed, or zygote, whilst the other sperm cell fuses with two separate female derived cells to form a 3 celled structure, which goes on to create the endosperm, or food structure, that accompanies the developing seed embryo. The endospem is vital as the food store for the seed’s subsequent successful germination. So, there is really a double fertilisation taking place, in all endosperm flowering plants.
So, if the rodent chompers nip through the pistil – and pollen tubes, after their tip’s and sperm cells have already grown a significant distance past the point of severance damage, are they still viable? I’m going to mark a couple of chomped Crocus clumps to see if I can count the number of seed pods being pushed up towards the end of June, but I guess the definitive answer to this issue would involve cutting through pistils manually, at differing times after pollination, and seeing whether seed capsules do still subsequently develop – an experiment for next year, I think.
In late February, we had another couple of severe frosts, so I’d nipped out just before bed to check on our blue bowl. No signs of an ice spike forming, but by torch light, held at just the right angle, one could make out planes of ice crystals growing down into the freezing water – already covered with a thin surface ice sheet, which by dawn had fissured in an interesting way, above. I had a go at photographing these ice crystal sheets, rather crudely with my hand-held torch since I don’t have an off the camera flash, and head on flash completely obliterates the visibility of the thin crystal sheets.
Not hugely impressive photos, but maybe sufficiently interesting to inspire someone else to look into freezing water at night, to glimpse what’s going on. I also tried a hand held time lapse, which didn’t show significant crystal enlargement in the short time I could manage to hold my camera and torch positions. Just 15 seconds of 1 second frame exposures, seems a heck of a long time when standing stock still in the freezing cold. However, it did show quite dramatic sub-ice, water movement currents, highlighted by particulate debris shifting around below the surface ice. But I was also then sent two pictures of an ice spike and ice vase by friends from just across the valley, which encourages me to stake a claim for Rhydcymerau, as being an ice spike hot spot.
Or should that be cold spot? (Thanks for the great pics, Gary). Amazing structures.Gary is also a talented wood turner/artist. Click here for a link to his website at wobbly bottom.
Less enjoyable nocturnal action came last week in the shape of a visiting bat, which somehow or other found a way inside, and then, as they do, attempted to escape from our bedroom shortly after lights out. Having a low, sloping ceiling means that frequent passes were so close to our snucked down heads, that you could feel the air movements from its beating wings. Having thought I’d trapped it downstairs, and, after grabbing my camera, it somehow reappeared in the stairwell and as I crouched low, fizzed over my head into the other end of the house.
I slammed the door. We returned to bed untroubled.But the following night’s supper was enlivened by Fiona’s screech, as it did an encore pass over our heads and dinners, before we opted to suffer a chilly evening and leave the front door open.
Fingers crossed, it hasn’t returned. So far.
Finally the verdict. Some liked the BBC2 ‘s Gardener’s World feature on Gelli Uchaf, others felt there weren’t enough garden scenes, or chat with us. Personally we thought a great job was done, given the weather, and the fact that filming took place on February 9th. The atmosphere of the garden was definitely captured.If they’d filmed this week, 4 weeks later, there were lots more flowers in the garden, but there is still the challenge of capturing the effect of en masse low growing small flowers, which I too struggle with.
The photos never do justice to the scene in front of you.
And often require you to lie prone on the ground to get any sense of how many flowers there are. If you do this, and take this low angle vantage point, then it’s well-nigh impossible to include a presenter or gardener in the scene as well. Or certainly not in a favourable way.So, hats off to the team, for what they achieved. And even better that they chose February 9th and not last Wednesday.
If they had, there could well have been fatalities, as a significant branch was ripped off the oak tree by a violent wind gust from the North and smashed into the slated barn roof, before coming to rest where most of the crew had been standing during some of the filming.
This tree definitely has previous form. I was once nearly skewered, whilst removing an even larger ripped off branch which had embedded its peripheral twigs amongst the azaleas, with its base barely hanging on by splintered remnants, a good 10 feet up in the air. After carefully chain-sawing the outer branches off, I reached the last one which, whilst still embedded in the ground, was preventing the severed base from tearing away from the trunk. Anticipating that removing this last small branch would de-stabilise the whole hanging structure, I was still shocked to see the complete 14 inch thick branch flip over in mid-air, and the jagged pointed base head towards me at alarming speed. I thought I’d dodged it, but at the last moment it readjusted its direction, and I had to drop the chainsaw before diving to one side to avoid being impaled.
Serenity has now returned. The daffodils are trumpeting. The kites are mewing and circling with their extraordinary, forked, rudder tails, driving lazy, wind driven recce flights overhead, with scarcely a wing flap.
The ground has finally firmed up.
Wonderful turn of phrase … “Orange gape-speakered dawn, dusk and midday rural muzak” – although I agree that ‘operetta’ would be more fitting!
Considering the difficulties, I think your photographs of ice crystal sheets came out rather well. I haven’t seen these before; they’re like delicate frozen ferns – really beautiful.
As for your homicidal tree – well I guess if someone were cutting your limbs off with a chainsaw you’d be pretty defensive 🙂
Thanks Noeline. Sometimes I spend time struggling with words to capture an image I have in my mind…I never have the time to rework stuff too much, but I did enjoy the end result with this post, including the thrush phrase..
The ice crystals were lovely – helped by the blue bowl background of course. As for the tree…, absolutely. Being a Tolkein and Ent fan, I have no difficulty in imaging a character inside this tree, trying to get it’s own message across in the only way it knows how!
Lovely Spring post Julian. I’ve seen video’s on You Tube linked to some folk’s blogs, that may help with your Thrush recording, apparently you create a You Tube account and upload your recording then link back on your blog. I haven’t done this myself but have been told! I wonder has your Bumble in the 3rd photo showing signs of mites? Interesting observations on Crocus and really admire your hand pollinations. Plus absolutely brilliant shot of the Vole on your first blog. Our tommies were disappointing this year and its almost certainly voles here, maybe they have a sweet tooth and its the nectar they like? But looking forward to your seed research. I watched GW, I hope they come back again, I guess in the parameters of a 30 minute show they have to edit but wanted to show my husband how wonderful your garden is but think he got the idea. I agree with Noeline too, the ice sheets do look like delicate frozen ferns. Glad you are enjoying some much deserved sunshine in the west!
Our issue with You Tube is our satellite broadband data allowances and speed… I do have a few videos uploaded..you can click on the tiny icon on the homepage, just below the FB sign, but I had to send a Flash card into the real world and ask my kind brother in law to upload them, then post the card back ….all a bit of a fag, and joke after hearing George Osborne in yesterday’s budget trumpeting then need for the country to gear up to 5G connectivity!!!
The ice crystals do look like ferns… really pretty though one dimensional in a random series of planes.- you just can’t capture this in a photo!
The Crocus chomping is interesting too…I meant to repeat in my post, that next year I’m going to try distraction feeding with apple rings (homemade) starting just as the Crocus begin to open, to see, if I can fill the voles up with that for a few weeks, until the flowers are over. I’m sure we have enough predators locally to keep the population in check through the rest of the year.
I doubt that GW will return, but the garden did have it’s brief moment, which was a huge thrill to us, particularly given the number of other gardens in Wales that the recce team had visited, large and small, before opting to come here for such an early season filming slot,
Great photographs, as always! Very impressive ice crystal images – tiny happenings that generally go unnoticed to the world 🙂
Thanks Inese. I like all these tiny happenings, which have passed me by for years…and now I have the time to be able to see and appreciate them.
I think Robert Browning has the answer to your thrush identification problem:
That’s the wise thrush; he sings each song twice over,
Lest you should think he never could recapture
The first fine careless rapture!
I think you are fortunate enough to be serenaded by a song thrush.
Wonderful selection of spring flowers once again. We’re still held in the grip of winter, but a few days of sunshine have perked things up a bit. Whatever the weather, west is definitely best.
Thanks for the comment, and solving the thrush id query. I do agree that we wouldn’t want to leave the West, for lots of reasons, but this does seem to have been a particularly mixed up ‘winter’, which now has an ever lengthening tail. But even a little bit of sunshine, and lack or rain, works wonders,
I’d have assumed that a chewed off crocus could not possibly produce seed but then I’ve just learnt that the crocus has ovaries beneath the ground! I never imagined a pollen tube might grow so rapidly either. That will teach me not to make assumptions! Your photographs are beautiful, especially the snowdrops. I love the header too. My header access has been changed and now I cannot change the colour of my header script which is doomed to rest Christmassy red . Amelia
Thanks for the comment Amelia. I had no idea that pollination was such an exquisitely complex and co- ordinated affair, before last week either.
What a shame about your header… have you tried getting onto the WP happiness engineers to sort it out??
I’m still stuck with an old theme ( because I like it, and understand it), whilst Fiona has started another blog, which doesn’t seem to give her some of the really useful options that I have. AS for photo software, I still use programmes over 15 years old….because they’re quick and simple to use… I’m not sure why all this stuff has to be continually fiddled with – at least for those happy with what they have.
Looking on the bright side, I suppose there are worse colours you could have been locked into??
This is true! I posted queries twice about my header but received no reply. I’ve had success with queries before so I take it that things have changed definitively.