The flowers are green in the bud stage, later red, becoming black as they age, the pistil 30.0–35.5 mm (1.18–1.40 in) long.

Flowering mainly occurs from July to December and the fruit is a more or less spherical to oblong follicle 12.5–18 mm (0.49–0.71 in) long.

[2] Wilson's grevillea grows in jarrah forest or woodland between Bindoon, Harvey, Northam and Williams in the Avon Wheatbelt, Jarrah Forest, and Swan Coastal Plain bioregions of south-western Western Australia.

[2][3][4] Grevillea wilsonii is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.

Propagation is from cuttings; grafting on the east coast of Australia may ensure greater reliability.