Westfield Heartnut is a cold-hardy Japanese walnut cultivar that produces heart-shaped nuts with a naturally sweet, bitter-free flavor, a rare trait that sets it apart from most walnut varieties. This ornamental tree reaches 20 to 25 feet tall and thrives in hardiness zones 4 through 9, making it surprisingly adaptable to northern gardens where walnuts are rarely grown. Nuts ripen in early September and are ready to harvest around 1,095 to 2,190 days after planting, depending on growing conditions. The tree itself is visually striking, with delicate green and yellow flowers that arrive in September, and it bears fruit as early as 3 to 6 years after planting when grafted.
Full Sun
Moderate
4-9
?in H x ?in W
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Moderate
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Westfield Heartnut produces genuinely sweet, edible nuts without the bitterness that makes other walnuts difficult to enjoy raw. It's cold-hardy enough for zone 4 gardens, yet grows into a handsome ornamental specimen 20 to 25 feet tall with attractive foliage and unusual September blooms. The tree adapts well to poorer soils and begins producing nuts surprisingly quickly for a walnut variety, often within 3 to 6 years on grafted stock.
Westfield Heartnut nuts are eaten fresh, raw, or roasted as snacks, a luxury compared to most walnut varieties that require extensive processing to remove bitterness. The large, heart-shaped nuts can be cracked and eaten whole, making them particularly appealing to families with young gardeners or anyone wanting walnuts that don't require special preparation to enjoy.
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Plant grafted Westfield Heartnut trees in early spring or fall, spacing them to account for a mature height of 20 to 25 feet. Choose a location with full sun and well-draining soil adjusted to a pH of 6.0 to 7.0. Water thoroughly after planting and maintain moderate moisture during the first growing season to establish a strong root system.
Harvest Westfield Heartnut nuts in early September in zone 5, when they have ripened and the outer husk begins to split or fall naturally from the tree. Collect nuts from the ground as they drop, remove the husk if still attached, and allow them to dry in a warm, well-ventilated location for several weeks before cracking and eating. The nuts are brown when mature and can be judged ready when the shell feels hard and the kernel inside is firm.
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“The Westfield Heartnut represents a deliberate selection within Japanese walnut breeding, chosen for its combination of cold hardiness and the rare trait of producing naturally sweet, bitter-free nuts. This cultivar arrived through commercial nursery development, made available as a grafted tree to home gardeners seeking a walnut variety suited to cooler climates where traditional English and black walnuts often struggle.”