Juglans ailanthifolia var. cordiformis


Michael's Opinion

This is a slower growing native tree that tolerates poor, dry soils. It also tolerates shade in its youth, but needs full sun at maturity, and is adaptable to acidic, neutral or alkaline pH soils. It's known to produce juglone, therefore it's important to consider other plants tolerances to this if you want to include this specimen in your plantings.

Botanical Information

FamilyJuglandaceae
GenusJuglans
Speciesailanthifolia
Varietycordiformis
CategoryWoody
TypeTree (deciduous)
Pronunciation

Details

USDA Hardiness Zone4-9
USDA Hardiness Ref.
Canadian Hardiness Zone4a-6b
Canada Hardiness Ref.
RHS Hardiness Ref.
Temperature (°C)-35
Temperature (°F)-30
Height30 m
Spread12 m
GrowthSlow
Flowering PeriodApril

Description and Growing Information

ShapeSlender, straight trunk with broad pyramid-shaped or rounded crown.
LandscapeUsed for shade but produces jugulone and there are a number of plants that are very sensitive to this toxin and will not grow in its presence. Wood is hard and durable, it is used for furniture, paneling, dowels, tool handles and lumber. It's also used for smoking meats.
PropagationFrom seed, direct sow outdoors in autumn or winter sow in vented containers in cold frames or unheated greenhouses. If growing from seed indoors, stratify seed for 3 months at 5°C.
CultivationAlthough it is usually found on wet bottom lands, it grows on dry sites and also grows well in poor low nutrient soils. It grows best on low, moist ground or in rich soil in higher ground.
Notable SpecimensThe Niagara Parks Botanical Gardens, Niagara Falls, Ontario, Canada.
Bark/Stem DescriptionGrey to brown and shallowly furrowed.
Flower/Leaf Bud DescriptionSulfur velvet scales and valvate buds with the terminal bud 1.2-1.9 cm long, with multiple scales overlapping the bud. The terminal bud is the longest most flattened bud and appears to be in two miniature leaves.
Leaf DescriptionStout side branches grow upwards. Alternate, pinnately compound leaves 15-20 cm long. Composed of 5-7 course leaflets on a central stalk that are sharply serrated. Spring and summer colour is dark green, while autumn colour is often golden yellow.
Flower DescriptionMonoecious, male flowers are catkins about 8-10 cm, while female flowers are about 13 mm. Both are pale green to chartreuse in colour.
Colour DescriptionStems are grey or reddish, pith is brown and solid. A weak yellow in autumn, but otherwise a rather fresh, light green during the growing season.
Texture DescriptionA coarsely textured tree.

Photographs