Glossy leaves and red turning deep purple-blue berries in autumn are the attractive features of this buckthorn. A deciduous, hardy large shrub to small tree, it is native to much of Europe, extending into extreme northern Africa and western Asia. This plant has proven invasive in the moist soils across much of eastern North America.
With smooth grayish brown bark, the glossy green to dark green leaves add interest to the plant. Each leaf blade is oval and ends in a pronounced tip that often has a tiny curl; the parallel veins that angle outwards from the leaf midrib are interesting. In spring, tiny pale yellow-white flowers appear in clusters at the bases of leaves at branch tips. After pollination by bees, small oval berries form, first green and then becoming red and finally a deep purple or dark blue in autumn. Birds will eat these fruits, and drop the seeds across the landscape, resulting in masses of seedlings and thickets, particularly in moist soils. The foliage remains deep green throughout the fall.
Grow it in full to partial sun in any average soil, keeping in mind moist soils will result in faster and more agressive growth tendencies. In fact, in order to lessen its potential invasiveness, do not plant in regions with rich, moist soils.
It can be an ornamental shade tree.
Information source: http://www.learn2grow.com/plants/frangula-alnus/
Genus - Frangula
Species - Alnus
Common name - Alder Buckthorn
Pre-Treatment - Required
Plant type - Tree, Shrub
Vegetation type - Deciduous
Hardiness zones - 3 - 8
Exposure - Full Sun, Partial Sun, Partial Shade
Height - 3 - 7 m
Spread - 3 - 8 m
Growth rate - Fast
Bloom season - Late Spring
Leaf / Flower color - Green / White, light yellow
Soil PH - Acid, neutral, alkaline
Soil type - Clay, loam
Water requirements - Average, Drought tolerant
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