Chestnut

About Chestnut

Chinese chestnut is a spreading nut tree about 40 to 60 feet tall that bears sweet, starchy nuts in spiny burs. It tolerates chestnut blight, the fungus disease to which the native American chestnut and chinkapins are very susceptible, so Chinese chestnuts and blight-resistant hybrids are the ones to plant for nuts.

NC State lists zones 4-8; dormant trees handle about -20 F (University of Missouri). Avoid frost pockets, where late freezes hurt swelling buds.

When to plant

Timing is counted from your average last spring frost (and first fall frost). Sow & Tell works out the actual dates for your ZIP code.

Spring planting is best: bare-root trees in March, container trees in late March or early October in Missouri (University of Missouri). In a backyard, plant at least three trees (different named varieties if grafted) 40 to 50 feet apart, in full sun. Grafted trees start bearing 2 to 3 years after planting.

Soil

Well-drained loam to sandy loam; heavy or soggy soil leads to Phytophthora root rot (University of Missouri). Chestnuts tolerate acid soil but not strongly alkaline soil (UC).

Work in any lime, phosphorus or potassium a soil test calls for across the planting area (not into the hole); aim for pH 5.5 to 6.5.

Feeding

• First year, early June, if new shoots have grown a few inches: nitrogen fertilizer such as 34-0-0. Spread about half a cup over the weed-free area around the tree.
• Each spring from the second year, before bud swell (about April 1 in Missouri): nitrogen fertilizer such as 34-0-0. Give about 0.1 lb of actual nitrogen per year of tree age in all, two-thirds now and spread within the drip line (a 3-year-old tree needs about 0.9 lb of 34-0-0 in all).
• End of flowering (about June 20 in Missouri): nitrogen fertilizer such as 34-0-0. Apply the remaining third of the year's nitrogen within the drip line.

Don't plant in heavy or poorly drained soil, which brings Phytophthora root rot; paint or wrap young trunks against sunscald.

Harvest

Burs split and drop nuts from September through October, over 2 to 4 weeks; pick nuts up at least every other day. Wear heavy leather gloves and roll burs under your shoe to pop out nuts (University of Missouri).

One crop each fall: burs drop nuts over 2 to 4 weeks in September and October, so pick up at least every other day.

Varieties (19)

Pests to watch for

Chestnut weevils, Potato leafhopper, Deer, Rabbits, Voles

Diseases and problems

Chestnut blight, Root and crown rot, Armillaria root rot, Sunscald

In the kitchen

Eaten raw, boiled or roasted, and used in stuffing, baked goods, soups, stir-fries and ice cream; dried nuts grind into a flour (UC).

Keeping it: Fresh chestnuts are almost half water and mold quickly, so chill them right away: keep them at 32 F or a little above in sealed 1- to 2-gallon plastic bags in the refrigerator, where they keep up to about 3 months (University of Missouri; UC).

Safety: Chestnuts are tree nuts, though the FDA's 2025 allergen guidance doesn't count chestnut among the major tree-nut allergens; people with a tree-nut allergy should still check with their doctor. The flowers have a smell some people find unpleasant, and falling burs are spiny and messy (NC State).

Pets: The ASPCA lists American chestnut (Castanea dentata) as non-toxic to dogs, cats and horses; no separate entry for Chinese chestnut was found. Don't confuse it with horse chestnut or buckeye (Aesculus), which the ASPCA lists as toxic.