The Unknown Known

   To paraphrase Donald Rumsfeld, defense secretary under W, there are the known knowns, the known unknowns, and the unknown unknowns. Donald, you forgot about the unknown knowns. Lets talk about gardening, not war, and the knowns that need to be better known.

Visitors to my garden (actually workshop attendees) were oohing and ahing over some 18-inch-high stalks each capped with a crown of leaves beneath which dangled a circle of red blossoms. Aptly named crown imperial, Fritillaria imperialis, deserves to be more widely known. No one seemed put off by the skunky aroma that suffuses the air even feet away from the plant; I like it.

Perhaps crown imperial would be better known if the bulbs didn’t go for more than 10 dollars each. My gardens’ profusion of crown imperial stalks is more an indication of my green thumb than my wealth. They all arose from a single bulb my father gifted me more than 20 years ago. I learned to propagate them by bulb scaling, which involves digging down into the ground to remove scales from the bulb, then mixing the scales with barely moist potting soil. After a couple of months storage at warm temperatures followed by a couple of months storage at cool temperatures, the scales can be potted up to be nursed for a season before planting out.

Every year I make new crown imperial plants. Will I ever have too many?

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F. michailovskyi

Crown imperial also has some unknown known kin. You have to see Persian lily, Fritillaria persica, to appreciate it. A written description -- foot-high stalks lined with nodding, small, plum purple to gray green flowers -- doesn’t do justice to the beauty of this bulb. I hope to start multiplying this one also. Another unknown known is Fritillaria michailovskyi, this one with nodding, bell-shaped flowers with yellow-tipped, purple petals.

F. persica

F. meleagris

Among crown imperial’s kin is also a known known: Guinea hen flower, F. meleagris, with large, nodding, checkered flowers. Even White Flower Farm sells these bulbs for less than a dollar each. No wonder they are better known.

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Let’s segue over to unknown knowns among fruits. 

Right now, a billowing wave of white blossoms lines my driveway, the blossoms of Nanking cherry (Prunus tomentosum), a shrub that can grow 8 feet high and wide. The show matches that of any other flowering tree or shrub.

What do other flowering trees and shrubs -- forsythia, lilac, flowering cherries, and the like -- offer after their flower shows subsides? Nothing, nada, zip. Nanking cherry, though, goes on to bear oodles of small red cherries with a flavor somewhere between that of sweet and tart cherries.

And what does it take to get a decent crop of sweet or tart cherries? Pruning, perhaps spraying and bird control. What does it take to get a crop of Nanking cherries? Nothing, nada, zip. The plants bear heavily with little or no care, and bear enough to satisfy birds, squirrels, and humans.

Okay, every rose has it’s thorns. Nanking cherries are small, one-half to five-eighths of an inch in diameter. The smallness is more than offset by plant’s beauty, its profusion of fruits, and its low maintenance .

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And one more unknown known: gooseberries (both gooseberries and Nanking cherries warrant a whole chapter in my book Uncommon Fruits for Every Garden).

Many people imagine all gooseberries to be small, green, and tart, suitable mostly for cooking. Not so! There are over a hundred varieties of gooseberry in various colors and sizes, and a whole category of them, what the Brits call “dessert varieties,” are for fresh eating. Good flavor is what should warrant gooseberries known known status among fruits.

Most important in growing gooseberries is to choose a good variety, both for taste and for resistance to disease powdery mildew. Don’t plant Pixwell; the berries are small, green, and tart. Do plant varieties such as Poorman, Chief, Hinonmakis Yellow, Red Jacket, Captivator, and Glendale. They’re all tasty and disease resistant.

If you want even better flavor and you’re willing to deal with powdery mildew, plant varieties such as Colossal, Whitesmith, Achilles, and Webster. Dealing with powdery mildew involves spraying, but it could be something relatively benign, such as horticultural oil, sulfur, baking soda, soap, or horticultural oil plus baking soda (1-1∕2 tablespoons baking soda plus 3 tablespoons oil in 1 gallon water).

Right about now, gooseberries can experience one more pest, the imported currantworm, which strips plants of their leaves, beginning at ground level. The leaves will grow back but the plant is left weakened. A spray just as soon as chewing begins will stop this insect in its tracks and, again, benign products such as insecticidal soap or horticultural oil should be effective. I’m training some of my plants as 3-foot-high trees, which might also thwart the worm because there’ll be no leaves near ground level on which the insects can begin their feast.

If all this seems like too much potential trouble for gooseberries, it’s not. The best dessert varieties have flavors that might be compared to that of grape, plum, or apricot, and have a “cracking” texture, a crisp flesh that explodes with ambrosial juice when you bite into them. A writer of the last century characterized gooseberries as “the fruit par excellence for ambulant consumption.” I agree, and you might also if they become a known known in your garden.

Fruits Galore & Georgia O'Keefe

Let’s see, what’s on my plate for today? No, not what I’m planning to do, but what’s on my plate, literally. I have gumis, figs, Nanking cherries, highbush and lowbush blueberries, black raspberries, red raspberries, black currants, red currants, tart cherries, and mulberries. And what a tasty lot they are, and for

so little effort. All that’s needed, for everything except the gumis and Nanking cherries, is pruning and mulching. The gumis and Nanking cherries, both with their branches bowing to the ground under the load of red fruits, need no care at all!

Gumis (Elaeagnus multiflora) are particularly abundant this year, for the first time ever. Either the bushes have grown large enough to pump out a large crop, or birds have been distracted by all the cicadas into leaving the gumis alone. Letting the fruits, which are flecked gold and the size of small cherries, hang on the bush until dead ripe gives time for the sprightly, sweet flavor to develop and the astringency to fade. It’s also a nice ornamental shrub, with leaves silvery on one side that are a good foil for the colorful fruits. Backtracking to a few weeks ago to another asset of this plant, sweet perfume from the flowers was drifting all over the yard.

The early fig crop, known as the breba crop, is also relatively abundant. One of my figs, mislabeled Green Ischia, bears fruit on new, growing shoots as

well as on last year’s stems. The breba crop, ripening earlier, develops on last year’s stems, a few of which I saved on the large tree in the greenhouse. The rest of the plant, like my other figs, which bear only on new, growing shoots, gets lopped back each autumn to 3 or 4 feet high. This crop, and for some figs this is the only crop, is called the main crop.

So right now Green Ischia has a breba crop ripening on the 2 or 3 stems I left from last year, and a main crop developing which will begin ripening around the end of August, along with the main crop on the other varieties of figs. These crops can be harvested from plants in pots or, as is the case for my Green Ischia, plants growing in the ground in a minimally heated greenhouse. The advantage of in-ground in the greenhouse is larger plants and, hence, more figs. Some people spend their money on in-ground pools; I spent my money on a greenhouse for in-ground figs.

The other fruits on my plate, with the exception of Nanking cherries, are familiar to most people. Many visitors have been sampling the Nanking cherries, and all except one were wowed by the fine flavor. The fruits are somewhat small and soft, but, in addition to good flavor, earn their keep for their fecundity, their not needing any care, and for white blossoms that drench the stems in spring.

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Soft pink, tubular swirls of calla lily (Zantedeschia spp.) flowers are like having a three dimensional Georgia O’Keefe painting right on my terrace. No, four dimensional, the added dimension being time, because the plants change day by day.

Calla lilies are also easy to grow. Put the bulbs in a pot, and water; enjoy

flowers in summer; bring the pot indoors before the weather plummets below freezing in autumn; store in cool basement through winter; bring out again in late spring.

My main problem with growing calla lilies is that I’d like more of them than the one pot now sitting on my terrace. New plants are thankfully easy to come by, besides being gifted them, in this case from my friend Sara. Beneath the ground, the plants spread by rhizomes, which are specialized, underground stems such as those found beneath ginger, banana, lowbush blueberry, and bamboo plants. Rhizomes have a segmented appearance, just like stems, with each each node sprouting feeder roots as well as an aboveground shoot. Come autumn or late winter, I’ll cut up the rhizomes and multiply my holdings.

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So what’s hard to grow around here? Apples. If you wanted to know the most difficult fruit crop east of the Rocky Mountains, that’s it. Apples.

The season started out perfectly, with good fruit set. A few well-timed sprays kept the snout-nosed beetle, plum curculio, at bay, as well as codling moth (the “worm” in an apple) and the fungus responsible for apple scab, whose effect is just what it sound like. But problems don’t end there.

As curculio exits stage left, apple maggot moves in stage right (but can be controlled by trapping) and codling moth stays around. Orange blemishes from cedar-apple rust pock susceptible varieties and scab, despite the sprays, also becomes evident, the result of our incessant wet weather. Fruits are cracking from changes in soil moisture. And still in the offing are summer diseases -- black rot, white rot, and bitter rot -- that can ruin any fruit that survives other scourges.

I can hear my mulberries, Nanking cherries, black raspberries, and other no-care fruits chuckling at me for all the care I lavish on my apples, to little avail.

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Dateline July 4: Cicadas are gone. Yeah!

Rational in Spring? No.

People are funny, and that includes gardeners. Gardening is basically simple: You put a seed in the ground and, backed by millions of years of evolution, that seed grows. Sure, there are a few more wrinkles, like choosing a sunny spot (for sun loving plants), a well-drained soil (except for bog and water plants), and enriching the ground with organic materials, and, perhaps, fertilizer.

But people love to complicate things. Hence, compost tea, biochar, and now, straw bale culture. A recent article in the New York Times about straw bale culture has everyone -- or at least the handful of people who told me of their plans for the season -- trying out this new and allegedly wonderful alternative to merely dropping seeds in the ground.

Actually, straw bale culture is not “new.” I wrote, over a decade ago, in my book Weedless Gardening, “Straw bale culture of vegetables originated in Europe from a need to grow plants where diseases had built up in greenhouse soils. The idea is to set a bale of straw on the ground and grow a plant right in the bale. You do this by poking a transplant into a hole gouged in the top of the bale and sprinkling some fertilizer on it. Given adequate water and nutrients, the plant roots grow throughout the bale, hardly realizing that they’re not in real soil. There’s no reason why this method could not be used to start a small garden anywhere. Put some paper down on the ground and create mulched paths between the bales.”

Yes, the method could be used “anywhere,” but there are also good reasons not to. First, straw bale culture is not really organic. With this method, plants are fed mostly by soluble fertilizers sprinkled on the bales. The essence of organic gardening is to feed the soil which, in turn, feeds the plants. Plant foods are released from the soil matrix through microbial action. Microbes respond, as do plants, to warmth and moisture, so nutrients become available to plants in synch with plant needs. In straw bale culture, roots are bathed in readily available nutrients whether they want them or not.

Barring diseased soil or trying to garden on a rock ledge, why use straw bale culture in the first place? What’s wrong with dropping a seed in waiting furrow in the ground? 

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Not that I’m that rational a gardener, especially this time of year.

I’ve admonished many a person to begin with a site that needs a plant, determine what plant would do well with those site conditions, and then -- and only then -- to go out and get the plant or order it. All that’s

opposed to wandering into a garden center this time of year, when such places are awash with all sorts of desirable plants, picking out a plant you like, and then running around the yard with it trying to decide where to plant.

I, of course, did the latter. A couple of weeks ago, I read about Concorde pear, notable for having “the beautiful shape and crisp texture of the Conference, which gives it an elongated neck and firm, dense flesh. Its flavor is vanilla-sweet, reminiscent of the supple sweetness of Comice pears.” (Supple sweetness?)

The plant is readily available in Britain, but not here. All of which made it all the more desirable. Did I really need a Concorde pear tree? Aren’t the more than 20 varieties I now have sufficient? Evidently not.

As luck would have it, a nursery an hour away had Concorde. The nursery, of course, had  many other desirables also. So I also bought Black Gem, a named variety of black walnut. Not that there aren’t plenty of wild black walnuts around here, but this was a named variety.

So today I will run around the yard with these two plants trying to decide where to plant them.

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The appeal of Black Gem is that it has a name. A “named variety” of plant is one that was either bred or selected from a wild population and found to be superior in one or more ways. Said plant is given an official name and then reproduced by some method of cloning, such as by cuttings or, as is the case with most fruit

and nut trees, grafting. McIntosh is a named variety of apple. Seedling apple trees that pop up randomly along roadsides are not. All plants of the same variety name are genetically identical.

Named varieties are not available for every plant and, for some, pretty much all seedlings are quite good. The hedge of Nanking cherries along my driveway -- and now in bloom! -- are merely seedlings, but all the plants are beautiful and yield, in a couple of months, great quantities of tasty cherries with virtually no effort on my part. No varieties are available.

Black Gem, according to the tag, yields “huge crops of light-colored, high-quality, delicious nuts that crack in large segments and offer a superior nutmeat-to-shell ratio. Thin husks slip off easily.” How could I resist?

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Excitement in some Seeds

There's still some space left in the March 10th lecture/workshop in Philadelphia. In the morning, I'll do a photo presentation about pruning fruit trees, shrubs, and vines and then, after lunch, we'll go out into the real world, at the Awbury Arboretum's Agricultural Village. For more information and for registration for FRUIT PRUNING SIMPLIFIED, please visit:
 http://chestnuthill.patch.com/events/fruit-pruning-simplified-with-lee-reich

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And now, on to what's happening up here on my farmden in New York's Hudson Valley . . .

Some inch-long, tapering white sprouts -- roots -- caused quite a stir today. For me, at least. The first was spotted inside a baggie of moist potting soil that I put in the refrigerator a couple of months ago. That sprout was attached to a marble-sized, brown yellowhorn (Xanthocerus sorbifolia) seed. Giving the bag a shake brought more seeds to the surface, all with emerging sprouts.

The other sprouts were in a Clementine tangerine box that, last summer, I had filled with potting soil in which I had sown seeds of Nanking cherry (Prunus tomentosa). The box sat outside along the north wall of my house until a couple of weeks ago, when I brought it indoors to warmth.

Without doing time in the cold, whether outdoors or in the refrigerator, neither batch of seeds would have sprouted. They needed, as do many tree and shrub seeds, a period of stratification, that is, time kept cool and moist. After a certain number of hours under these conditions, typically about 800 hours for hardy trees and shrubs, the seeds can sprout unless temperatures are too cold.

I chose my words carefully when I wrote “cool and moist” above; temperatures below freezing contribute nothing to this so-called cooling “bank.” So, outdoors, those Nanking cherry seeds put time into their chilling bank this past autumn and during any of winter’s warmer days. If that time hadn’t been sufficiently long, hours in the “bank” could have been topped up in late winter and early spring.

A refrigerator is just the right temperature for stratification, too right in some ways. The consistently cool temperatures there fill up the chilling bank hours quickly, so quickly that seeds collected in late summer and stratified there often sprout in December, which means indoor planting at a time when growing conditions are at their worst. That’s why my yellowhorn seeds didn’t get a good soaking and then tucked into the bag with potting soil in the refrigerator until late November.

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Forget about the nuts; yellowhorn is worth
growing even just for its flowers

The yellowhorn seeds came from a tree I planted many years ago. I planted it because yellowhorn was billed as a small, hardy tree with a nut very similar to a macadamia nut. Yes, the nut does look like a macadamia, inside and out, and it’s about the same size. But yellowhorn nuts taste nothing like macadamia nuts. The yellowhorn nuts from my tree are barely edible, roasted or raw.

So why am I so excited about the nuts (seeds) sprouting to give me additional plants. Yellowhorn is a beautiful tree with ferny leaves and drooping, large clusters of purple-throated, white flowers that rival and resemble orchids.

Run-of-the-mill, seedling macadamia nuts are not as tasty as named varieties that have been selected over the years. No named varieties of yellowhorn exist. Perhaps a tasty clone may one day be discovered. Perhaps one of the sprouting seeds in my baggie will grow into a tree that will be the one that bears those tasty nuts. 

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Nanking cherry is another story, as far as taste. Like yellowhorn, no named varieties of Nanking cherry exist. But I’ve tasted the fruits, which are small, sweet-tart cherries, from many different plants in many different places over many years, and they all taste good.

Like yellowhorn, Nanking cherry also sports beautiful flowers. Each year in early spring, my Nanking cherry shrubs are drenched in such a profusion of pinkish-white blossoms that you can hardly see the stems.

Nanking cherry stems are hidden behind
the oodles of fruit this plant bears 

Another plus for Nanking cherry is that it is pest-resistant and bears reliably every year. The usual pests of cherries -- curculios, fruit flies, brown rot, leaf spots, borers -- are insignificant on Nanking cherries. And the plant laughs off extremes of temperature: It’s native where winter lows plummet to minus 50°F and summer highs soar to 110°F, and even though the plants’ blossoms open early in spring, spring frosts are never a problem. Did I mention that the plants also grow quickly and bear young, typically a couple of years after planting?

All this is not to say that Nanking cherry could not be improved. Some selection or breeding could slide flavor more towards the sweeter end of the sweet-tart scale. Larger fruit would be welcome. Mostly, the cherries are a mere one-half to five-eighths inch in diameter.

So last summer I collected seeds from fruits that were a little bigger and a little sweeter than the rest. Those were the seeds I planted in that Clementine tangerine box. I’m going to let these plants grow until warm weather settles in spring, then move them outdoors. In 2 or 3 years, I’ll be sampling fruits from these seedlings. I’ll save and plant some seeds from shrubs bearing the largest and tastiest fruits, and plant them. Perhaps I’ll eventually have some better Nanking cherries. At the very least, I’ll have lots of them.