japanese walnut (juglans ailantifolia var. cordiformis)

japanese walnut (juglans ailantifolia var. cordiformis)

japanese walnut, or heartnut, is a graceful walnut species from japan, best known for its unique, heart-shaped nuts that crack easily to reveal a sweet, mild kernel. unlike the thick, stubborn shells of black walnut or butternut, heartnuts open cleanly, making them one of the most user-friendly nut trees for both growers and eaters.

the nuts ripen in late summer to early fall, borne in clusters on spreading branches. their flavor is delicate and buttery, excellent for fresh eating, baking, or roasting. wildlife are equally fond of them — squirrels, turkeys, and other nut-hungry creatures flock to heartnut groves just as they do to native walnuts and hickories.

ornamentally, heartnut is a beautiful tree in its own right. its wide crown, large tropical-looking leaves, and broad, arching form give it presence in the landscape. in autumn, the foliage turns a clear yellow. the tree is hardy, fast-growing, and well adapted to a range of soils, thriving in fertile, well-drained ground but tolerating tougher upland conditions as well.

ecologically and culturally, heartnut bridges worlds: an asian cousin of our native walnuts, but long appreciated by homesteaders and nut growers in north america for its productivity and ease of use. it makes an outstanding shade and mast tree, combining beauty with food value in a way few species can match.

planting notes

height: 40–60 ft

spread: 40–60 ft, broad and arching crown

soil: prefers deep, fertile, well-drained soils

light: full sun

fall color: yellow

growth: moderate to fast

wildlife: nuts relished by squirrels, turkeys, and other wildlife