Harbison’s Hawthorn An American hawthorn, possibly a natural hybrid and now quite rare, Crataegus harbisonii is a small, vigorous, thorny, deciduous tree or large shrub, up to 25’/7.5m tall. The leaves of Harbison's Hawthorn are ovate, shiny green and slightly downy. White flowers appear in May. Crataegus harbisonii fruits are round, orange-red, 12-22mm long, and slightly downy. Site: Will tolerate inland and mild coastal exposureSoil: Any reasonable soil other than very wetPosition: Full sun or partial shadeSeason of Interest: Blossom in Spring, berries in AutumnHardiness: Fully hardyHeight: 13-26ft (4-8m) Spread: 13-26ft (4-8m)