The why of fruit thinning

I noticed one of the apples in the food forest had finished blooming and now had tons of tiny apples clustered on its branches. I took the situation in hand and started to pick them off.

13217562 - close up of bee pollinating apple blossom
photo by Jenella

Five flowers form on each spur, leaving five small fruits after pollination. They naturally fall off, one by one, until a single fruit is left to make seed. Contrary to what we might think, an apple has grown to its maximum potential within thirty days after the flower drops its petals. From this point, any ‘growth’ is just cells filling up with sap like balloons. The number of balloons to be filled with juice resulting from cell division is already decided.

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I was pulling off all but one fruit on each spur. From this, I expected each apple left on the tree would have more nourishment from the tree, be larger, and better shaped. If I had waited for the tree to pair down the fruits itself, it would have divided that nourishment between all those extra apples that would never stay on the tree anyway.

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Is there a drawback to this unnatural thinning? Perhaps.

When plucking off the fruits I noticed a few had codling moth damage. I have gotten fine harvests of apples from my trees, with very little, if any, codling moth damaged in years past. Whether this is an especially good year for codling moth population or not might explain this damage. Or perhaps the tree had dropped much of the fruit with codling moth damage so I never noticed? It quickly occurred to me the tree grows the extra fruit in part to increase the chances at least one will make seed -as codling moths eat the seeds of the apples they infest.

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Codling moths have several generations through a season, so we will see if the moths come back for more later.

Another effect of thinning apples is more regular fruiting. The seeds in each fruit create a hormone that blocks fruiting the next year. Some varieties of apple are notorious for their violent fruiting cycles -one year not a fruit on the tree, the next (or year after that) the branches break for the myriad fruit clogging the works. By thinning, a moderate amount of hormone is produced every year, allowing a moderate amount of fruit every year.

Perhaps such staggered fruit production in un-thinned apples is a tactic for cutting down on codling moth population?

As is, thinning delivers better results for me. But my trees are also quite small -just barely above my head. Thinning falls into what I call pleasurable interaction with the food forest, or work I enjoy, and usually only takes five minutes or so to complete.

I may quit it in years to come, and just trade thinning time and larger fruit for hacking out the good hunks from myriad smaller fruits. Masanobu Fukuoka, when his students asked how they could grow good apples without equipment and sprays, said to simply feed the poor quality fruit the students thought eminent to pigs. I’m not so skeptical as Fukuoka’s students; I have seen my trees produce quite healthy fruit already, so we’ll see what they give as the system builds. Below are some of my Fuji apples last year.

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You may wonder how the heck massive orchards ever thin their fruit one by one. By machine? No, by chemicals. Hormones in trees largely dictate the quality and growth of the fruit. We have developed an array of synthetic hormones, of which there are no counterparts in nature, that cause apple trees to drop their fruit. Run some experiments to properly calibrate the dosage, and you have thinned trees by simply spraying. Some of the hormones they have developed even increase the cell proliferation process beyond what the fruit tree offers, resulting in abnormally large fruit. I’ll let you research the health effects of these synthetic hormones.

When I first came across this information years ago, I went on a long search for an equivalent that could be derived from plants. I didn’t come across one, or any information on a hormone pathway that could cause the fruit to drop, accept for stressing a tree, or simply reducing pollination. I am suspicious there is an even more elegant answer:

I find that increasing the health of trees and their ecology in general can can at times truly transform their character. Mortal Tree is still a long ways from being notably fertile. But Fruiting factors are building on their own in some places. So perhaps the good effects will get out of hand, and produce some good results I never would have expected. 

 

PASSIVE salad 

How do you make a salad from perennial vegetables? How do they pair? Is there a best way to slice them? My friend and client Elora lately posted a short video showing how she makes salad from her PASSIVE garden.

Harvesting from a Perennial Garden (~2 minute watch)

What are your favorite perennial salad pairings?

If you’re new to this blog, you might like to read the post about Elora’s garden establishment here For example:

She has posted about the garden before on her blog, The Blonde Butter Maker, and tells me she plans on making a lot more content on how passive agriculture fits into her and her family’s day to day life. I started design in their yard about three years ago, and am so pleased they are seeing such excellent results.

Here is the recipe Elora uses in the video:

Salad burnett -a loose handful

French sorrel – 3 to 5 leaves

Scorzonera -10 leaves

Welsh onion -5 of the green tops picked off, or 1 onion removed from the base up.

Chocolate mint -2 sprigs

Stritello -loose handful

Some mache stems and leaves -as much as a handful.

Violet flowers for garnish -as many as 30 flowers per salad

The scorzonera, sorrel, and onion greens should be chopped -preferably into thin strips cut lengthwise. Mix this with the stritello and salad burnett and mache. The chocolate mint can then be chopped fine and evenly dispersed over the top with violet flowers for garnish. A light vinaigrette would compliment this best.

Food from shade: solomon’s seal and hosta shoots.

Hosta are ubiquitous to the flowerbeds of the world as any plant you can imagine. While some take sun with less complaint than others, many are misplaced in sunny positions, and run ragged because of it. They are really shade plants, preferring a fertile understory of trees.

Solomon’s seal (Polygonatum biflorum) is harder to find, but can live on even less sun than hosta and still be happy.

Both are edible. “Urui” is the vegetable name for hosta where it’s eaten in Asia. The young “hostons,” as some forest gardeners call the plants just coming up in spring, are best for eating. As the leaves unfurl they’re still edible, but become more tough and stringy as the season unfolds.

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Solomon’s seal too, is best when sprouting in spring. The leaves have a slightly bitter element; which personally I don’t mind, but others may prefer omitting by stripping the leaves from the stalk. It’s the stalk itself that has the really good flavor, which is hardly different from asparagus -with the umami richness kicked up a notch.

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This makes a lot of sense if you consider how closely solomon’s seal is related to asparagus. They are both in Liliaceae -the Lily family.

I’m harvesting both hosta and SS from parts of the food forest that are in dappled sun now, but will have little to no light once the trees leaf out. Asparagus, which as a rule prefers sun, is just showing up to the party as these two are just passing their prime. Few annual garden crops are even planted now, let alone ready for harvest to fill the “hunger gap,” but these two are shooting to the sky, ready to be crisply snapped off their stems, and sauted in the skillet.

They’re simple to prepare: “hostons” may be sliced in half lengthwise. 

Solomon’s seal I leave whole. You could peel off the leaves to remove any possibility of bitterness. Just snapping their stems at ground level I have not found any hard bases like asparagus, so no chopping necessary.

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Once prepared, heat oil of choice in a pan, and add the shoots. I flavored these pictured with some pepper, fish sauce, and vinegar to compliment the bitter element. You may prefer to omit the vinegar if the leaves are removed from the Solomon’s seal. Once tender, they’re ready for the plate.

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I got my Solomon’s seal in a trade online with the understanding they were giant Solomon’s seal (var. comutatum), and certainly appreciated getting twenty or so rhizomes freshly dug. They have not achieved the height my neighbor’s specimen achieve every year though; mine stay around three feet, hers shoot to six easily. So I think there was a misunderstanding. I may get some of the larger kind in the near future.

As for variance in hosta, I can’t vouch for the quality -especially when it comes to the hybrids. My neighbor is a formidable collector of hosta, and has even brought me with her to purchase direct from hosta breeders; so the fact that there are myriads of hosta, with crazy exotic chemical attributes and textures out there is real in my mind. Usually the blue, and dark green varieties are best for eating.  In this dish, I prepared H. nigrescens, and ‘Sum and Substance’ (a hybrid of unknown parentage), both of which aren’t too rare. These are mostly the throwaway hostas from my neighbor’s massive collection -seedlings that have no name, and extras.

Thriving in the dark corners of the food forest, these two are making food, and beauty, in places little else would grow.

Building beds with bricks

The mulch-generating polyculture for Mortal Tree’s PASSIVE garden system is going well. It’s the bed in Foundation for a future I am establishing with bricks.*

The intent for this bed, per A bit blunt method, was to shift the rocks every couple of months to kill off the grass underneath. This worked pretty well for most of the bed. I shifted the bricks in July and made a final small shift about a week ago. Above is the freshly shifted “mulch” around an amorpha.

I also tried covering a small part with grass mulch in May last year, and this took care of any weeds growing through the cracks. Below is the planting now. Like most fun times, there is a mess to clean up afterwards. This bed had a lot of fun last year. What you see is actually mulch I applied, the healthy comfrey, and some amorpha interplanted. I plucked out the little bits of green quackgrass, and look forward to some very lush, beautiful growth here come summer.

I plucked out the quackgrass when I shifted the rocks. Because they block sun and moisture loss, the rocks encourage the quackgrass to grow shallow, allowing me to just pick them up rather than pulling them. What roots did grow deeply are easily pulled because the soil is so soft under the bricks.

 


This soil conditioning is one if the main perks of using rocks. The soil life is everywhere, with centipedes, worms, spiders -even at this cold season. Soil between the bricks which heaved from the freezing over winter is unbelievably friable. It looks like it has been tilled.

Considering how low this soil is in organic matter, with a clay-coal base, with no amendments like sand or ever even being tilled before, I am very excited to already have such results. The moisture and soil life have brought it so far because I have created the right habitat, covering the soil. The organic matter is starting to accumulate.

Above are some amorpha leaves dropped last fall, which likely have brought in nitrogen the system formerly did not have. The plants were already beginning to nodulate in their pots when I planted them last year. If you would like to learn more about how I ensure they make nitrogen and get off to a good start, I have some notes here on Growing amorpha.

I also harvested some of the comfrey leaves last year, which I left around the plants I harvested from. This is breaking down into gorgeous soil, bringing in carbon the system did not formerly have.

Pictured is some broken down comfrey from a larger patch in the food forest. This new patch should be producing similar soil in the near future. It’s already well on its way.

 

*This could have been done with some large piece of canvas or the like, or a large piece of plywood. One of my clients decided to try clear plastic just to block water, which was still effective at removing the plants underneath.

Orchard understory

Is the space around your trees still empty? Try these plants:

10 Companion Plants for Orchards (~4min read)

This article provides a pretty neat survey of plants that, together, make a diverse, healthy, productive orchard. Any of the listed plants of especial interest?

The rules of spacing

I was at a Christmas party in conversation with a local Timken engineer who, hearing I design food forests, wanted to pick my brain on apple trees. He had six trees in two rows of three, well spaced in his backyard. He was throwing out terms about the mainstream organic sprays he was using, and framed his questions expecting me to know some super organic spray, or spray regimen, that would fix his problems of pests and low vigor in general. I don’t think he expected the answer I gave: ‘What’s planted around the trees?’

We often think of the rules of spacing as rules for keeping other plants away from each other. In practice I find the lines blur between species, and enters a much more broad science: it’s what should be included near the plant, as well as what shouldn’t. Between these two aspects, you make or break the majority of fruit tree problems.

The lines often blur between species because, let’s face it, plants don’t grow in a vacuum and always have something growing up against them. In this guy’s case, his trees were planted right into his lawn. They were in competition with the grass.

Looking at their history, grass and trees are in most cases nemesis of one another. Trees make forest; but grass needs open space. The setting in most yards of trees with grass between is quite artificial, and only exists because we keep the grass mowed. In any other situation, trees would take over.

The prairies are the kingdom of grass, and these occured because of rain shadows, or areas where circumstances such as the Rocky Mountain range messed with the winds that carry rain, creating droughts in one part of the year, and near flooding in another. Trees don’t like that, because most have relatively shallow roots, as much as 80 percent residing in the top three feet of soil depending on the kind and its conditions; but prairie plants, such as the grasses, and N fixers like senna hebecarpa, put roots down unusually deep, so reach the water table whether rain comes or not.

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An experiment showing the root growth of Red Delicious apple tree two years after planting.
Have you ever wondered as you pass woods how the trees survive so close? If you were planting an oak tree in your yard that would someday reach a hundred foot tall, can you imagine the spacing recommendations? They would be over fifty feet apart. Most yards couldn’t fit more than one tree. But in the woods they stand on top of each other, growing for hundreds of years, happy, and healthy.

Studies have shown that trees can grow their roots deep into the ground, but prefer to keep their roots higher in the soil if possible. There is more organic matter, hence nutrients and water, in this layer. If there isn’t, trees will try to put in the work to grow deeper. This is a lot more work, and certainly isn’t their first choice.

What trees really prefer is building networks in which they share and preserve resources. For instance, trees have what is called hydraulic redistibution, which is a fancy term for moving water not only up for their own use, but back down into the soil for storage, and horizontally to other plants. Peter Wholleben, in his book The Hidden Life of Trees recalls his surprise when he found a ring of roots from a beech tree that must have been cut down well over a century beforehand, but still had green, living roots showing above ground. It had no leaves, and the stump was gone. As he explained, citing various studies, the living trees around this ancient (should be dead) tree were feeding it sugars made in their leaves, keeping it alive. Likely, they got some kind of kickback from the extended root system because it allowed them access to more resources.

This is in ancient, established forests, so conditions aren’t quite the same for our young transplants. We can get some similar effects by growing fruit trees in more open settings, or riparian zones. These are zones similar to fencerows and overgrown fields where grasses are just converting to trees. These zones are iconically untidy and wild; but skillful gardeners know the elements of these zones, like clay in a potters hand, have the best potential to form the most beautiful, lush gardens.

Riparian zones have many layers, with notably high numbers of low growing herbaceous and woody shrubs, many of which are nitrogen fixers. The quickest way to simulate this ecology is making ‘guilds’ of plants right around your fruit trees. Here is my manual of bed building for info on quickly clearing grass without tillage. Plan on expanding these plantings every year until the beds around your trees meet. If the tree is older, and larger, the bed should extend at least a couple feet beyond its drip line.

An example guild: 1. Fruit Tree 2. Comfrey 3. Siberian Peashrub 4. Amorpha fruticosa 5. Japanese Wineraspberry 6. Honeyberry 7. Blueberry 8. Turkish Rocket 9. Crambe cordifolia 10. Stepping stones, (or in this case, stepping logs). The green base is a ground cover of mint.
Any guild should include at least 2 woody nitrogen fixing plants, about 5 plants that do not fix nitrogen but can be cut for mulch, such as comfrey, or a groundcover of something like mint, then several fruiting shrubs like raspberry or honeyberry, and some perennial vegetables.

This is the best method if you already have fruit trees in the ground, like our engineer friend. If you’re just planning your food forest, Robert Hart, the father of the northern food forests, recommended planting full size or standard fruit trees at recommended spacing for their size, in rows like any orchard, but then semi standard or medium trees, then dwarf trees, then shrubs, then herbaceous plants, then vines to climb and fill in the cracks between them.

Photo credit: Graham Burnett.
I’d recommend mulching as much as you can, and planting that area with a complete planting like this. The space should be completly filled with plants, and will establish faster with less work overall.

This system gives quite attractive results that are increasingly less cost and labor than serial applications of even organic, clay-based sprays, pyrethrums and neems, let alone the more harsh chemicals. There is work later on, but this is of course dabatable, because its mostly harvests of fruit. Sounds like pleasant work to me.

Making friends with rodents

Blurring gray fur and tails pour like a waterfall onto the floor in front of me. A tense minute, and the place is cleared -bare, clean cement floor, and nothing but hushed scurrying sounds all around. I’d just turned on the light.

This was one summer long ago, when several old building were torn down by the Township very near our chicken house. These were an old garage, another chicken pen near it, and a large old barn. They all housed droves of rats. Where did they go when these building fell? Our place.

We had quite a clean operation. When the rats came, we cleaned it to the max, removed all the wood shavings, straw bales, any and all feed -no matter how tight its container, and even some of the chickens. Despite the cleanup, the invasion lasted for months.

They were too smart to fall for traps. Eerily, one of the traps we found set off with no rat in it, had a freshly gnawed twig from the lilac bush right outside the pen stuck in it, the bait removed. My dad stayed up several nights shooting them with pellet guns. He terminated the lives of hundreds, but only recovered a few because the rats began eating their fallen, dragging them back into their holes immediately, or gnawing into them on the spot. To say nothing of a few unfortunate chickens that fell prey when the lights went out.

The rats made this new house their home in short order -with or without resources. They dug enormous piles of soil out from under the cement flooring, brought in food from some place. We had removed everything else.

When specialists begin throwing out statements about harshly mowing orchards to keep rodent and rabbit from gnawing away bark and roots of trees, I am a bit skeptical. These creatures create habitat for themselves and are part of thriving ecologies. They are eaten by almost everything, providing a vital link in the trophic system. If you have ever studied how these systems work, reducing one part of the chain, reduces, or at least effects, all the others following. If you reduce rodents, you by default reduce potential health of the trees you’re trying to protect.

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A casualty in my parent’s small orchard. This tree was about five years old when snow fell, and a freezing rain covered the snow with a sheet of ice that remained for about two weeks. Rabbits, mice, and voles ate everything they could get at, including large trees like this one. See the gnawed bark at the bottom.

Rodents feed into a very broad system. Finding examples of what happens when rodents are entirely removed is difficult because we have seldom pulled this off in outdoor settings. If we have come close, someone is also fertilizing and pruning a lot to make up for the loss.

Rodents have many immediate effects too. For one, they dig holes, which allow more air and water to percolate into the soil. This is very good for soil health.

It’s interesting to note the trees most immune to damage by rabbits, voles, etc. are single seeded species, like peach and plum. The species most vulnerable are multi-seeded species, like apple and pear. Rodents and rabbits, every couple of years when the food gets scarce, devour the bark off a couple of these trees, killing the trees. If they didn’t these multiseeded species have a higher chance of sprouting on top of each other, and choking each other out.

Only one successful seed is necessary to replace its parent. Rodents are a factor which ensures the chance any young tree grows to adulthood is very, very low. This is a good thing in natural conditions. It means trees are more likely to be well spaced.

But how do we make our tree “the one” that grows to adulthood when we’ve already taken spacing into account?

The most effective move is just installing tree guards; simple spiral guards are fine for young trees; tree guards like these are better for larger trees. Larger trees are less vulnerable to girdling, but I have seen trunks near five inches in diameter girdled to the hard wood if the snow lays thick enough long enough. For these sizes, I am not a fan of corrugated plastic pipe guards because they’re extremely hard to get on and off, often harming the tree in the process. Even covering the trunks with tinfoil or fine wire mesh is better than nothing.

Opaque tree guards also protect from sun scald: when bright sun reflecting off cold snow heats the cold tree bark, making it crack. This isn’t good. Covering the trunk helps prevent it.

Another tactic is to provide food for the rodents (No, I’m not nuts. Keep reading). The fact is, rodents and rabbits will be present whether you like them or not. If you mow the grass, they will dig tunnels. If you remove food, they will find it, and store it.

I’m not the only one recommending this. One extension service informational pamphlet extolled mowing the grass in an orchard to the finest bits to reduce cover, yet recommended throwing out sunflower seeds when the snow fell. This is intended to divert the eminent population of rabbits, voles, and mice -now forced into starvation.

Apparently the specialists are aware their mowing and trapping are only mildly effective, and that the real issue is diverting and blocking the rodents when times get tough, not killing them. Natural predators do that.

It seems most logical to just leave the tall grass and brush -at least in isolated corners, so the rodents can feed themselves.

There are also biological deterrants, such as Sepp Holzer’s bone tar. Here is a forum discussion on the subject. Sepp Holzer explains making bone tar and its use in his book. I own a copy, and quite like it. I have never gone through the trouble of making bone tar though. Tree guards have done the job for me.

There is an idea that planting certain bulbs and other plants around a tree deter rodents and rabbits -especially voles, which eat roots underground. In controlled studies, ground covers like Pachysandra species, and bulbs like daffodils are themselves very unpalatable to rodents. This doesn’t necessarily deter their cozying up to your trees.

I’ve had trees with no guard brutally stripped by rabbits, despite a ring of daffodils around it. Keep in mind, when hunger gnaws, rodents gnaw just about anything -tasty or not. While these plants might deter voles from eating roots, don’t expect these to block the possibility of girdling.

Ecosystems keep a pretty tight control on rodents and rabbits as is. If we simply focus on making a healthy, lush habitat, giving your trees the protection to make them “the one” that succeeds in growing to adulthood, the rodents can function less as your foes and more as your friends. The alternative is certainly not as pretty.