Gadenin日本語Get the appA low-input shrub, and what that actually means
Nanking cherry evolved on dry, cold, poor ground, and it performs best when you treat it that way. Once past its second year it survives without irrigation in most climates, needs no annual fertilizer in reasonable soil, and carries fruit whether or not you did anything for it. The gardeners who lose bushes are almost always the ones who did more, not less: a rich mulch heaped against the stems, a spring dose of lawn feed, an irrigation line running every day next to a shrub that wanted dry roots.
That said, the difference between a neglected bush and a well-managed one shows in fruit size and in how long the plant keeps cropping. Deep water at the right moment swells the berries. Restraint with nitrogen keeps the wood hard and the flower buds forming. Airflow through the middle of the bush keeps brown rot down. Those three things are the whole of Nanking cherry care.
Everything below assumes a plant in the open ground. In a container the shrub is a different animal: it needs water constantly, it needs feeding, and it will not reach full size or full yield.
| Season | Water | Feed | Other work |
|---|---|---|---|
| Late winter | None | None | Prune if you did not prune after harvest |
| Bloom to fruit set | Only in drought | None | Frost watch, hand pollinate if cold |
| Fruit swelling | Deep soak weekly if dry | None | Netting against birds |
| After harvest | As needed | Light, only if growth is weak | Renewal pruning, remove suckers |
| Autumn | Taper off | None | Top up mulch, clear fallen fruit |
Watering: deep, rare, and never standing wet
Water an established bush only when the soil is dry 4 inches (10 cm) down, and then soak it thoroughly, putting 5 to 10 gallons (20 to 40 liters) slowly over the whole root zone rather than a splash near the stems. A deep soak every week or ten days in a hot dry spell is far better for the plant than a daily sprinkle, which keeps the surface wet, encourages shallow roots and does nothing for the fruit.
The one period where water genuinely changes the crop is the three or four weeks between fruit set and ripening. Nanking cherry berries are small and thin-skinned, and a drought during swelling makes them smaller and drier still. If you water this bush once in a season, water it then.
The signs of too much water are easy to read and easy to misread as drought: leaves that yellow from the bottom of the shrub upward, wilting on a hot afternoon that does not recover overnight, and dieback of whole stems. If you see that combination, dig down and check. Wet soil around a wilting Nanking cherry means dying roots, and the fix is drainage, not more water.
Feeding, and why nitrogen costs you fruit
In average garden soil this shrub needs no fertilizer at all. Where the soil is genuinely thin, or where a bush has put on less than about 6 inches (15 cm) of new shoot growth in a season, apply a light dressing of a balanced fertilizer or a couple of inches of compost spread over the root zone in early spring. That is the whole feeding program.
Heavy nitrogen produces long, soft, sappy shoots at the expense of flower buds. Those shoots also fail to harden before winter, so they die back at the tips, and they are the growth that aphids find first. A Nanking cherry planted in a lawn that gets fed regularly is the classic case: a big, healthy-looking, dark green bush that flowers thinly and crops badly.
Mulch does more than fertilizer here. Two to three inches (5 to 8 cm) of wood chip or bark over the root zone, renewed every year or two, holds moisture, suppresses the grass that competes for it, and feeds the soil slowly as it breaks down. Keep it pulled back from the stems by a hand's width.
Suckers, and keeping a shrub rather than a thicket
Nanking cherry throws suckers from the base and, in loose soil, from roots a foot or two out from the crown. This is useful when you want a hedge or a windbreak and a nuisance when you want a fruiting bush you can walk around and pick from. Left alone for several years the plant becomes a dense thicket whose interior is shaded, unproductive and impossible to reach.
Decide which you are growing and manage accordingly. For fruit, keep the plant to somewhere between five and eight main stems of different ages and cut everything else out at ground level. For a hedge, let the suckers fill in and simply keep the line to the width you want.
- Take suckers out at the base, not partway up Cut flush with the ground or slightly below it, so no stub is left. A shortened sucker branches and comes back as three. Use pruners on anything under half an inch (12 mm) and loppers above that.
- Do it twice a year, not once every three A pass in late spring and another after harvest takes suckers while they are soft and thin. Once they are two or three years old they have become structural stems and removing them leaves a large wound on a shrub prone to gummosis.
- Keep a young stem or two in reserve Do not remove every sucker. On a fruiting bush, allow one or two strong new stems a year to grow on as replacements for the oldest wood you will cut out later. This is how the shrub stays productive over decades instead of ageing all at once.
- Watch the drip line for root suckers In sandy or cultivated soil, shoots appear several feet from the crown. Trace each one back and cut it where it joins the root if you can; pulling snaps it and stimulates more. Mown grass around the bush suppresses most of them for free.
Lifespan, decline and planning ahead
A Nanking cherry is not a lifetime plant. In good conditions it crops well for around 20 to 30 years, and on stressed or poorly drained sites it can fade in half that time. Decline shows as thinning growth, dieback at the branch tips, sap oozing from cracked bark, and a crop that gets smaller each year despite good pruning. Once several main stems are affected, the plant is not coming back.
Because the shrub fruits within two or three years of planting, replacement is straightforward if you plan for it. When a bush enters its second decade, put a young seedling in nearby so it is already cropping by the time the old one comes out. Doing this on a rolling basis means you never have a gap in production, and because seedlings vary you get the chance to select for better fruit each time.
Keep the bush clean as it ages. Clear fallen fruit from under it, cut out dead and cankered wood whenever you see it, and never leave prunings lying around the base. Most of the diseases that shorten a Nanking cherry's life overwinter in exactly that debris.
Each season, note the shoot growth on your bushes, roughly how much you picked, and any stems you removed and why. A bush whose annual growth has dropped below about 4 inches (10 cm) and whose yield has fallen two years running is telling you to start its replacement now, not when it dies.