Single or paired, 4-6 cm in diameter; thick green or brown husk; irregularly ridged, thick-shelled inner layer covering sweet edible nut
Black walnut is found on a variety of sites but grows best on deep, well-drained neutral soils that are moist and fertile. It grows slowly on wet bottomlands, dry ridges, and slopes. Black walnut is common on limestone soils and grows extremely well on deep loams and fertile alluvial deposits. Good agricultural soils are generally favorable sites for black walnut.
The root system usually consists of a deep taproot and several wide-spreading lateral roots.
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