Juglans nigra Black Walnut - Environmental Horticulture - University ...

Juglans nigra -- Black Walnut Page 2Figure 2. Shaded area represents potential planting range.FlowerFlower characteristics: inconspicuous and notshowy; spring floweringFruitFruit shape: roundFruit length: 1 to 3 inchesFruit covering: dry or hardFruit color: black; greenFruit characteristics: attracts squirrels and othermammals; fruit, twigs, or foliage cause significantlitter; showyTrunk and BranchesTrunk/bark/branches: grow mostly upright and willnot droop; not particularly showy; should be grownwith a single leader; no thornsPruning requirement: needs little pruning to developa strong structureBreakage: resistantCurrent year twig color: brown; grayCurrent year twig thickness: thickWood specific gravity: 0.55CultureLight requirement: tree grows in full sunSoil tolerances: clay; loam; sand; acidic; alkaline;extended flooding; well-drainedDrought tolerance: highAerosol salt tolerance: highSoil salt tolerance: moderateOtherRoots: surface roots can lift sidewalks or interferewith mowingWinter interest: tree has winter interest due tounusual form, nice persistent fruits, showy wintertrunk, or winter flowersOutstanding tree: not particularly outstandingInvasive potential: little, if any, potential at this timeOzone sensitivity: tolerantVerticillium wilt susceptibility: not known to besusceptiblePest resistance: very sensitive to one or more pestsor diseases which can affect tree health or aesthetics