According to observations of naturalists and beekeepers.
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Bitter cherry occurs from British Columbia and Vancouver Island south to southern California and east to Montana, Wyoming, Utah, and New Mexico.
Bitter cherry is a native, deciduous, small tree or shrub with spreading to ascending branches. It often forms dense thickets. It generally persists as a medium to tall shrub, 3.3 to 20 feet (1-6 m) in height. With abundant moisture and deep fertile soil, bitter cherry may reach tree height: up to 50 feet (15 m) in some areas.
The leaves are 0.8 to 2 inches (2-5 cm) long and 0.4 to 1.4 inches (1-3.5 cm) wide. The drupelike, ovoid fruit is 0.24 to 0.56 inches (6-14 mm) in diameter and is one-seeded. Roots may spread up to 50 feet (15 m) from the parent plant, sending up adventitious shoots along their length. Bitter cherry has no taproot.
Bloom Period: April-June. Cherries ripen July to September, dispersal occurs August through September.