Deciduous, Shrubs, Trees
Although usually grown for their edible nuts (see Filbert, Hazelnut), includes very attractive ornamental shrubs or small trees. The plants have separate female and male flowers. Female blossoms are inconspicuous; male ones are showy, appearing in pendent catkins on bare branches in winter or early spring. Leaves are roundish to oval, with toothed margins. Thin branches as needed in late winter; remove suckers when you see them.Corylus avellana
Grows 10 to 15 ft. high and wide. This is one of the species grown commercially for nuts (for those descriptions, see Hazelnut). There are many ornamental varieties in this group.Corylus cornuta californica
Native to damp slopes below 7,000-ft. elevation, northern Coast Ranges and Sierra Nevada of California, north to British Columbia. Open, multistemmed, to 5–12 ft. high and wide. Roundish, somewhat hairy, coarsely toothed, 1 1/2–3-in. leaves turn bright yellow in autumn. Small nuts with flavorful kernels are enveloped in a leafy husk with a long, attenuated beak.Hazelnut
Native to southeastern Europe. This is one of the species grown commercially for hazelnuts (also called filberts). This is a heavily suckering shrub to 12–15 ft. high and wide, but it can be trained as a small tree, as it commonly is in orchards. Needs a pollinator.
–Barcelona– is the classic variety. Productive, flavorful, as some resistence to Eastern filbert blight.
–Butler– has gone by the boards. Was used as a pollinator, but gets Eastern filbert blight.
–Casina– is from Spain. Most heavily planted hazelnut in Oregon in 1995. Mid to late pollen shedder. Cross with –Hall–s Giant–. Thin shell, perfect nuts for processing. Moderate resistance to Eastern filbert blight.
–Daviana– has a large, elongated nut, flavorful. Very susceptible to Eastern filbert blight. Not planted much any more.
–Du Chilly– is old, going by the boards. (Pronounced as it looks.)
–Ennis– is still heavily planted, though it is susceptible to Eastern filbert blight, because it is so very productive. Nuts are big and pretty, but late to mature. May not mature north of Seattle.
Filazel is a shrubby cross between Corylus cornuta and Corylus avellana. Seedling mostly; takes to to pollenate. Takes -25–, can bear in cold country.
–Hall–s Giant– is a great pollinator, compatible with everything. Has some resistence to Eastern filbert blight.
–Royal– out of favor, not much planted any more. Susceptible to Eastern filbert blight.
–Santiam– is the only blight-immune hazelnut.
Trazel (pronouced TRAYzel). Tree-form cross between Corylus colurna and Corylus avellana.
Drought-tolerant and cold-tolerant to -25– F. Good where standard hazelnuts won–t produce a crop.
Big, slightly pointedfruit. Astringent. Very shapelytree for ornamental use.
From Brazil, but naturalized at higher elevations throughoutHawaiian Islands. Known botanically as
Milkweeds (so named for their milky sap) are the best-known representatives of this group of plants. B...