WHAT I LEARNED ABOUT BRUSSELS SPROUTS
Sprout Success
Years ago, a friend referred to Brussels sprouts as “little green balls of death;” that never exactly increased the gustatory appeal of this vegetable for me. The same could be said for “a little boiled to death,” a too common way of preparing the vegetable, and perhaps that’s what the friend had actually said.
Still, I’m always up for a horticultural challenge, even if I had never had success with Brussels sprouts. What does “lack of success” mean with Brussels sprouts? Dime-size sprouts.
Sit tight. This season my Brussels sprouts are a roaring success, and I’m going to impart to you what I learned about growing this sometimes maligned vegetable. Or, at least, what I did differently this year, which was a few things, so I’m not sure whether one or more of them was responsible for my achievement. It could even have been the weather, which I had no hand in.
Brussels sprouts is a very long season vegetable, so seeds need to be sown in spring for a fall harvest. Check. I planted mine back indoors in March for transplanting in May. They could have been sown a little later, at some sacrifice of yield.
A big difference in what I did this year was that the seeds that I sowed were those of a new variety, Catskill. Although a new variety for me, Catskill is actually an old variety, first introduced in 1941 by Arthur White, of Arkport, New York. It’s billed as yielding especially large sprouts (yes) on compact stalks (nope). In previous years I grew Gustus, Hestia, and Prince Marvel, and all were duds for me.
The Catskill mountains are only an hour’s drive away from my farmden, which perhaps explains my success with the same-named variety. But, as they often say (quietly) in advertising, “your results may differ.” My suggestion is to try a few varieties until you find one that does well wherever you garden or farmden.
Brussels sprouts requires a rich, near neutral soil high in organic matter. Check. My Brussels sprouts beds have always received, as do my other vegetable beds, an annual dressing of a one-inch depth of compost. Decomposition of compost enriches the soil with a variety of nutrients, including nitrogen.
Still, another big difference in what I did this year was to give my plants an extra oomph with, in addition to the compost, a sprinkling (1 pound per 100 square feet) of soybean meal, an organic source of nitrogen.
In anticipation or hope of large plants, each Brussels sprouts plant was afforded plenty of elbow room this year, with plants two-and-a-half feet apart down the middle of the three-foot-wide bed. They were flanked on each side by a single row of early carrots which, I figured, would be harvested and out of the way by the time the Brussels sprouts plants were spreading their wings (leaves).
My previous efforts with Brussels sprouts always resulted in three-foot-high plants that, early in their youth, flopped to the ground. Only after a plant’s supine stem had created a firm base would the end of its growing stem curve more or less upward, according to original plan. That youthful waywardness wasted and muddied lowermost sprouts, with the sprawling plant demanding even more space, which was a problem in my intensively-planted garden.
This year each plant had the companionship of a sturdy metal pole right from the get-go. Loops of string around the stalks and the stakes kept up with the plants’ upward mobility.
Pest Alert
Finally, and very important, is pest control, specifically of any one of the few leaf-eating caterpillars, colloquially called cabbage worms, which are the offspring of of those cheery, white moths that flutter among the plants on sunny days. The caterpillars also attack broccoli, cabbage, and cauliflower, all relatives in the cabbage family (Brassicaceae).
A very effective and nontoxic to most creatures (including to you and to me) control is spraying with Bacillus thuringienses, a naturally-occurring bacterium extracted from the soil. This material is more easily remembered under the name Bt, packaged up under such commercial names as Thuricide, Dipel, and Monterey B.t.
I checked the plants frequently through the growing season, at first just crushing any caterpillars I found and, only when the damage was getting severe, resorting to the spray. Cabbageworms, like any pest, can develop resistance to most pesticides, more likely the more that is used.
GMO. No
As an aside, that potential resistance of a pest to Bt is a problem with crops developed as genetically modified organisms wit Bt toxins. Almost all commercial corn and cotton have been genetically engineered in this way; the genetic material has also been incorporated into cotton, potato, rice, eggplant, canola, tomato, broccoli, collards, chickpea, spinach, soybean, tobacco, and cauliflower.
The problem arises because a field of plants expressing the Bt toxins is akin to that whole field being sprayed with Bt all season long. There is evidence of the development of resistance to Bt by insect pests of the genetically modified crop plants.
FERTILIZING 101
Feed Sooner, Not later
Although shoot growth of woody plants ground to a halt weeks ago, root growth will continue until soil temperatures drop below about 40 degrees Fahrenheit. Root and shoot growth of woody plants and lawn grass are asynchronous, with root growth at a maximum in early spring and fall, and shoot growth at a maximum in summer. So roots aren’t just barely growing this time of year; they’re growing more vigorously than in midsummer.
Remember the song lyrics: “House built on a weak foundation will not stand, no, no”? Well, the same goes for plants. (Plant with a weak root system will not be healthy, no, no.) Fertilization in the fall, rather than in winter, spring, or summer, promotes strong root systems in plants.
By the time a fertilizer applied in late winter or early spring gets into a plant, shoots are building up steam and need to be fed. Fertilization in summer forces succulent shoot growth late in the season, and this type of growth is susceptible to damage from ensuing cold.
They Hunger For . . .
The nutrient plants are most hungry for is nitrogen. But nitrogen is also the most evanescent of nutrients in the soil, subject to leaching down through the soil by rainwater or floating off into the air as a gas. The goal is to apply nitrogen so that it can be taken up by plants in the fall, with some left over to remain in the soil through winter and be in place for plant use next spring.
Two conditions foster nitrogen loss as gas. The first is a waterlogged soil. If you’re growing most cultivated plants — yellow flag iris, marsh marigold, rice, and cranberry are some exceptions — your soil should not be waterlogged, aside from considerations about nitrogen. (Roots need to breathe in order to function.) Nitrogen also evaporates from manure that is left exposed to sun and wind on top of the soil. Manure either should be dug into the soil right after spreading, or composted, after which it can be spread on top of the soil, or dug in.
Leaching of nitrogen fertilizer is a more common and serious problem, especially on sandy soils. The way to prevent leaching is to apply a form of nitrogen that either is not readily soluble, or that clings to the soil particles. Most chemical fertilizers — whether from a bag of 10-10-10, 5-10-10, or any other formulation — are soluble, although a few are specially formulated to release nitrogen slowly.
The two major forms of soluble nitrogen that plants can “eat” are nitrate nitrogen and ammonium nitrogen. Nitrate nitrogen will wash right through the soil; ammonium nitrogen, because it has a positive charge, can be grabbed and held onto negatively charged soil particles. Therefore, if you’re going to purchase a chemical fertilizer to apply in the fall, always buy a type that is high in ammonium nitrogen. The forms of nitrogen in a fertilizer bag are spelled out right on its label.
Go Organic
Rather than wade through the chemical jargon, nitrogen loss through the winter can be averted by using an organic nitrogen fertilizer. Nitrogen in such fertilizers, with the exception of blood meal, is locked up and held in an insoluble form. As soil microbes solubilize the nitrogen locked up in organic fertilizers, it is released first as ammonium nitrogen. So by using an organic nitrogen source, the nitrogen is not soluble to begin with, and when it becomes soluble through the action of microbes, it’s in a form that clings to the soil particles and not wash out of the soil.
(Except in very acidic soils, other soil microbes then go on to convert ammonium nitrogen to nitrate nitrogen. This reaction screeches almost to a standstill at temperatures below 50 degrees Fahrenheit, so the ammonium nitrogen can just sit there, clinging to soil particles, until roots reawaken in late winter or early spring.)
Common sources of organic nitrogen include soybean meal, cottonseed meal, fish meal, and manure. Hoof and horn meal, leather dust, feather dust, and hair are esoteric sources, though plants will make use of them as if they were just ordinary, organic fertilizers. Even organic mulches, such as wood chips, straw, and leaves, will nourish the ground as they decompose over time.
The Cadillac of fertilizers is compost. Compost offers a slew of nutrients, in addition to nitrogen, released slowly into the soil as microbes work away on it. Compost — most organic fertilizers, in fact — are not the ticket for a starving plant that needs a quick fix of food.
Every year I spread compost an inch deep beneath especially hungry plants like vegetables and young trees and shrubs to keep them well fed. Less hungry plants get one of the above-mentioned organic mulches. The benefits of these applications continue, trailing off, for a few years, so annual applications build up continual reserves of soil nutrients, doled out by soil microbes, that translate to healthy plants and soil.
(More details about fertilization can be found in my book Weedless Gardening.)
A DELECTABLE PEACH
A Time Machine
A few days ago, a fuzzy orb that I held in my hand became a time machine. This time machine was a peach, and time travel took place immediately after I took a bite out of it. There I was, no longer eating the peach on my friend Wendy’s farm — Wendy is a botanical artist, https://drawbotanical.com — but in the backyard of my youth, biting into a peach from our backyard tree. (Our home “orchard” also consisted of two crabapple trees, whose fruit was morphed under the direction of a great aunt into jelly, and a pear tree that I remember bearing only one fruit that I watched daily only to find it, one day, gone, picked prematurely by my sister.)
Back to the time machine peaches. These peaches would never sell at a supermarket, even a farmers’ market. Their skin was very fuzzy and a washed out yellow color, some with just a hint of a blush. I remember, when I worked for Cornell University Roger Way, the apple breeder at the time, bemoaning the fact that “Americans eat with their eyes.” Spots from peach scab disease on many of the fruits did nothing to increase their visual appeal.
“Would never sell,” that is, unless a taste was offered. Protected within that admittedly ugly skin was a meaty, golden yellow flesh. The flesh was sweet and, in contrast to most peaches these days, very rich-tasting, with a strong peachy flavor. It’s that peachy flavor that whisked me backwards in time.
I Make a New Peach Tree
Long gone peach
This year has been the best ever fruit year in decades around here, even right here on the farmden, where the low-lying site is not very fruit-friendly. Peaches always fail here; a few weeks ago I finally cut down my one tree. Twice over the past years I planted apricot trees, knowing that they are one of the fruits least likely to succeed around here. I was right; they are long gone.
Against my better judgement I am going to once again venture into peachdom. Perhaps Wendy’s peach is resistant to peach ills: brown rot, plum curculio, oriental fruit moth, bacterial spot, and peach scab. (Yes, her fruits were afflicted by scab, but not enough to diminish the pleasure of biting into them.)
Wendy isn’t sure of the variety name of her tree so I can’t order that one from a nursery. No matter.
Pits saved from some of the fruits can be grown into whole new trees. Seed-grown peach trees grow quickly and can take only three or four years before their branches are adorned by fruits. Plant a peach pit now, and it will not sprout until next spring, even if you keep it warm. Like other temperate-zone fruits, the seeds need to be stratified, that is, they must experience winter before they’ll sprout. If they sprouted now, the young, tender seedlings would succumb to winter cold.
Plant the pit outdoors, and it will be naturally stratified. I prefer to fool the pit by cracking the outer shell, soaking the seed in water for a few hours, then putting it in a plastic bag, along with moist potting soil, in the refrigerator. Refrigerator-stratified seeds sprout more quickly than outdoor planted seeds because once the outdoor-sown seeds have experienced enough cold, a total accumulation of about 1,000 hours of temperatures between 30 and 45 degrees Fahrenheit, they have to await spring warmth before they’ll grow.
Seeds stratified in the refrigerator will often sprout in the bag within a couple of months, at which point they need to be planted. I plan to pot them up and let them grow in the greenhouse.
Seed-grown fruit trees generally don’t bear fruit identical to the fruits from which the seeds came. It depends on what variety pollinated the flower that became the fruit, and how the chromosomes got juggled around. Peach trees are self-pollinating, which reduces the variability from fruit parent to fruit child, so there’s a good chance that a seed grown peach tree will yield tasty fruit. In contrast, plant an apple seed and there’s about one in 10,000 chance that the fruit from the resulting chance will even be edible.
If I wanted an exact replica of Wendy’s peach, I could beg a branch from her tree and graft it onto a peach rootstock. What’s a peach rootstock? It could be any peach tree grown from seed.
And Almonds!
Despite apricot’s strong nomination for the tree crop least like to succeed around here and, actually, pretty much everywhere in eastern North America, it does not win the prize. Almond trees are less likely to succeed. With that said, in this best of all years for fruit, here in the Northeast, at least, Wendy managed to harvest her first (and perhaps her only) crop of almonds this year.
Almonds are closely related to peaches. Their common ancestor diverged six million years ago with the separation resulting by the lifting of the Himalayan massif. Both plants suffer from the same insect and disease problems.
Two characteristics put almonds in the most likely to fail category. First, in humid climates, the nuts themselves are apt to spoil. And second, almonds have a very low chilling requirement. (Just as seeds have chilling requirements before they will sprout, flower and stem buds also have chilling requirements before they can sprout.) With a low chilling requirement, almonds would likely break dormancy and flower with the first hint of warm weather in spring, then succumb to likely subsequent frosts.
But not this year.
Needless to say, I will not be giving almonds a try on my farmden.
Almond illustration, by Wendy
