Some Degree!

DSCN3180_kindlephoto-159357232Many of you will have stood upon the 0° longitude line, our very own Meridian in Greenwich. Quite a few will have crossed the 0° latitude line, the equator. Some will have heard of the 47th parallel, famous for defining part of the border between the USA and Canada.

Many have drawn a right angle and some view everything under a different angle.

But do you know the magic of the 137.5° angle?

A 137.5° angle is known as the golden angle, because it occurs when cutting a circle into two pieces under the golden ratio: 360° – 360° / φ ≈ 137.5°, where the golden ration φ ≈ 1.61803, or (1 + sqrt(5))/2 precisely.

Many plants grow according to the golden angle, for example by growing a new leaf rotated around the stem from the previous leaf by 137.5°. The effect is that the leaves grow with minimum overlap, therefore maximising sun exposure on every leaf. Not just little overlap but the minimum overlap mathematically possible. Isn’t that clever?

I don’t think our fruit trees show much appreciation for the golden angle, but one might still find other more mathematically-minded plants out there. I am inclined to give the nettles a closer look, or the Giant Hogweed and its relatives, also the horsetail’s thin leaves, raspberries and blackberries, or the dandelion and hop flower maybe?

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Get It While You Can

DSCN3958We were out and about in the Piggeries Orchard this week, with the usual agenda of looking after things in general and looking after re-emerging bramble, enthusiastically growing bindweed and the new horsetail growth in particular. All in all we collected two wheelbarrows of the unwanted flora.

Most importantly though, we learned what to do, and what not to do, with the Giant Hogweed that grows in the back right corner.

Giant Hogweed, or Heracleum mantegazzianum, is an invasive plant. The phototoxic sap causes severe skin burns in contact with sunlight, sometimes with lasting scars. Burns can occur several days after contact with the sap and are quite unpleasant at best and horrific at worst. Wikipedia has more details about the plant and the skin reactions, which are called phytophotodermatitis.

The bottomline for us is fairly straight-forward:

  • Remove the plants as early as possible using a spade, taking as much root with you as possible. The plants die easily and compost.
  • Never touch the sap, a broken leaf stem or root. Use gloves and touch only the leaf itself. Don’t lick your gloves.
  • Don’t hack at the plants, shred them, or use a power strimmer of any sort as these can spread sap uncontrollably.
  • When in contact with sap, rinse, stay out of sunlight and seek medical advise.

It all sounds more dangerous than it is if handled with care, but the danger is not to be taken lightly and a good dose of careful responsible handling is prudent.

Similar risk and precautions apply to related “friends”, the Common Hogweed and Hemlock, also common in the Grand Union Canal corridor.

I don’t actually know the statistical risk profile but I would feel confident to say that you are more likely to stumble across a rabbit hole and break an ankle than suffer from severe phytophotodermatitis caused by accidental contact. But still, when you’re out there chasing the bramble invasion or chasing after your dog, whether you are taking a sunbatch in the meadows or flying a kite with your children – just be careful, OK?

No Orchard Love

daffToday is Orchard Love Saturday, our monthly activity Saturday. While we are all full to the brim with orchard love, there will be no public display of our passion today. Our activity Saturday for today April 14th has been cancelled.

Please do not meet us at 11 o’clock.

We cancelled today’s activity due to lack of necessity, but avoiding entry into a major mud bath also appeals, as we find much of the terrain to be very boggy right now.

We made a first round cutting Hemlock and vegetation surrounding the fruit trees across Elthorne Triangles and Terraces, Osterley Lock and the Hanwell Meadows already, and plan to do the same in The Piggeries Orchard and St Margaret’s Orchard over the two coming Tuesday evening activities.

In other words, we are on top of things, ready to watch trees and fruit to grow.

There will be no shortage of future opportunities to become involved, to express your love for publicly accessible community orchards and share our dislike of bramble roots, littering or vandalism. Join us every Tuesday evening and every second Saturday of each month, just not today.

No Appointment Necessary

DSCN3941We anticipated vandalism in certain areas and got very little, but suffer a series of minor and sometimes larger damage in unexpected areas. The beautiful terraced slopes between Elthorne Park and the Grand Union Canal, which we call Elthorne Terraces, seem to be the hotspot.

Trees are snapped off, branches are torn. Fires are lit, sometimes with the least appropriate fuel of green wood, and of course there’s a range of litter from drink cans and bottles to shoes and garments. Most baffling and frustrating is the repeated theft of rabbit guards. Rabbit guards. Really. I am serious. The prompt return of the little critters and subsequent damage from rabbit bites is guaranteed. Some of the bites marks look more like penknife practise to me, but whether the damage is done directly or by proxy makes no difference to me.

I cannot summarise my exact thoughts and feelings in language suitable for a public web site posting, but I am happy to dispense explicit lectures upon request. No appointment necessary; you’ll find us every Tuesday evening tidying up after you along the orchard trail.

 

 

Climate Change

pollination

First I want it cold, now I want it warm. You’d think I am in a hormonal transition! But truly, we need climate change, and we need it now.

We got through the winter all right, even though the Beast From The East threatens with a chill over the Easter weekend.

Our next challenge is pollination.

Trees are very sensitive to cold weather at flowering time and a night of frost can wipe out a large proportion of the crop. Even without frost, damp and outright wet conditions prevent many pollinators from flying: While bees can fly in the rain for limited distances, they like cold rain about as much as you or I. And there is the temperature to consider:

Pollen germination requires at least ~5 C, and the all-important pollen tube grows very slowly below 10 C. When it grows too slowly, the pollen deteriorates before fertilisation occurs.

So, we need 10 C at least, and reasonably dry conditions for the pollinators to fly and do their job. Honey bees fly from ~16 or 18 C, bumble bees and solitary bees begin 5 degrees earlier.

In other words: we need climate change.

We need a warm spring with just the right amount of rain, followed by those sunny long summer days and balmy evenings before a glorious golden autumn awaits us, full of sunshine and full of fruit which somehow managed to grow and ripen against all these odds and challenges.

Having said all that:

Happy Easter!

Join us after the Easter celebrations for our first Tree Tending Tuesday of the year!

We’ll meet Tuesday April 3rd, 18:30 o’clock at Elthorne Triangles by the Trumpers Way Scout Hut. No tools or experience necessary!

Tree Tending Tuesdays

tttTrust me. There is no better excuse for getting away from work on time, for catching a breath of fresh air, for getting involved, for doing something useful for the good of all, and for having a lively discussion (and a drink) than our Tree Tending Tuesdays!

Tree Tending Tuesdays are back after Easter, starting

Tuesday 3-April, 18:30

(We will start at 19:00 as soon as we can find our way back to the Fox without torchlight.)

Everyone is most welcome to come and join us in these weekly activities. We prune, pick litter, fix rabbit guards, replace tree labels – oh yes, and we cut a bramble and nettles, later in the growing season. A lot of brambles and nettles. No experience is necessary, all abilities welcome (if you can navigate the terrain), and all training given.

See our volunteer schedule for the location (which is normally finalised at least 24 hours beforehand), and join our volunteer email list for updates straight into your email inbox, into your smart phone, your pants pocket or handbag!

A Chilling Thought

daffThey forecast another cold spell for this weekend as I write these lines. After this past week’s balmy weather, this could spell trouble for early opening buds.

But did you know that cold is good, if done right, for fruit trees and biennial plants like cabbage, sugar beet, celery or carrot? These plants all need to reach deep sleep through a cold period before they can blossom. Much like we rest through the night, apple trees, for example, typically need 1000 hours below 6 or 7 C, and not too much below 0 degrees through the dark season.

Of course we all know that much below freezing is called “freezing” for a reason! It’s no longer a chill, and much above 6 or 7 degrees makes some boys peel their shirts off. A chill is between 0 and 6 or 7 degrees, give or take.

1000 hours, that’s 42 days or a month and a half to you and me. The chill units don’t have to be sustained just like we don’t need to slumber through 6 to 8 hours of deep sleep every night (scientifically known as NREM Stage 3). It seems obvious, but is not clear to me, just how much fluctuation in temperature the trees can take before they are stuck in light sleep and fail to reach full dormancy.

Please let us know if you are a local fruit tree whisperer.

Different varieties and different species have varying chill unit requirements. Local weather records shows that most of February, much of January and some of December should qualify for plenty of apple tree chill hours, albeit not always continuously.

A third of the orchard trail has been planted three years ago and trees are looking fabulous, so we should see those trees bear a reasonable harvest thanks to the lovely cold. Provided the bees will fly at the time of blossom, and no hard frost will hit late, and the many other factors that make successful organic fruit growing a bit of a game of chance won’t come to fruition. Fingers crossed!

At least it’s nice to know that we have been shivering for a good cause, don’t you agree?

Allied Forces

1454758625797Our March Saturday of Orchard Love is coming up soon. Thankfully there isn’t much work along the orchard trail right now, so why not help out our friends from Southall Transition with their big planting day for the Southall Orchard Project?

Please come help plant the Jubilee Park Orchard on Saturday 10 March 2018, 10:30 – 14:30.

They will supply tools, refreshments and the Mayor of Ealing. All you need do is let them know that you are coming (please register here), wear sturdy footwear and dress appropriate for the weather and the occasion.

(photo by Southall Transition)

The Race Is On!

p20160522132521You’ll have noticed the only red fruit and green foliage today is within our logo, but you have also seen Daffodils and Crocuses emerge and announce the next season.

Surely it is still too cold and early in the year for apples, pears or quinces to blossom, but with a bit of sunshine and a sheltered location the apricots or even cherries might not be all that far away from coming into bloom.

May I suggest that you take a camera or smartphone with you as you walk the real or hypothetical dog along the orchard trail? We’d love to see your snaps of signs of spring. Any sign, but those of budding buds and blossoming flowers would be of particular interest.

The race is on!

apricotUpdate 15-March: the race is over. Thanks, Tim, for submitting the Apricot at Osterley Lock:

The Busy Trap

IMG_20180210_120943686_HDROnce again, we felt into it: we were almost too busy to take pictures at last week’s 2018 tree planting, can you believe it? You’d think we’d know better by now.

First we were too busy getting started, sorting 38 trees and bundles of hedges, tools and volunteers out. Then we were too busy planting trees and hedges in two planting parties covering the entire stretch between Osterley Lock and Blackberry Corner. Then we were too busy finishing the job with tree planting at The Piggeries and St Margaret’s Open Space, all while dodging the pretty persistent and unpleasantly cold rain.

We thank everyone who came to help regardless of the less-than-ideal weather. The trail looks really great right now and we can’t wait to see the new trees come to life in a few weeks.

Thank you, James, for taking these snaps.