Black Walnut (Juglans nigra)


126 in stock


Type: Deciduous tree

Family: Juglandaceae

Height: 75-100 feet

Spread: 75-100 feet

Native Range: Eastern US, statewide in Missouri

Ideal Site Requirements:

Soil: organically rich, well-drained soils

Water: medium

Sunlight needs: full sun

Tolerates: drought tolerant but intolerant of shade

Landscape use: Large tree for large landscapes, inappropriate for street tree use

Brief Description: Large tree with oval to rounded crown, mature trees often have few low branches. Bark is distinctly fissured, and ridged in diamond patterns. Produces edible but hard to extract nuts.

Possible Problems: No serious insect or disease problems. Potential diseases include anthracnose, bacterial blight, root rot, canker, leaf spot and shoot dieback. Watch for aphids, fall webworm and a variety of foliage chewing caterpillars. Black walnut roots produce chemicals called juglones which are very toxic to certain other plants such as azaleas, rhododendrons, blueberries, peonies and solanaceous crops (tomatoes, peppers, potatoes). Most of the toxicity is limited to within the drip line of the tree. Nuts can be quite messy in fall. Husks can stain clothing and sidewalks.

Stand out Features: Walnuts are inappropriate for many sites and prevent the growth on many others plants within their drip lines.

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