Dead branches should be removed close to the trunk, flush with the bark. When poorly managed or growing wild, the Oregon grape can grow spindly or spread wide, preventing the growth of more desirable plants. It is an evergreen shrub growing 1 m (3 ft) to 3 m (10 ft) tall by 1.5 m (5 ft) wide, with pinnate leaves consisting of spiny leaflets, and dense clusters of yellow flowers in early spring, followed by dark bluish-black berries. Oregon grape is best left unpruned, but should be pruned to remove any dead, damaged, or deseased growth. Pruning may be needed to remove dead branches, encourage bushier growth, promote more flowers, or maintain a specific size or shape. If plant exceeds height and width requirements the older taller stems can be removed at the base of the plant. July 6, 2010 • I’m wondering when is the best time to prune my Oregon grapeholly? Mahonia aquifolium, the Oregon grape, is a species of flowering plant in the family Berberidaceae, native to western North America. Pruning of stems and leaves can be done to acquire a desired shape. For the best look, take your time while pruning. Why Oregon Grape Holly Shrubs? The Oregon Grape Holly, or Mahonia aquifolium, comes in dwarf and full sized cultivars, and outshines many more common types of hollies with it’s blooms and fruit. Oregon grape (Mahonia aquifolium) grows wild in several areas of North America. Much like many hollies, the leaves of this plant are pointed and sharp making it a good hedge or background plant. Mahonia aquifolium, Oregon grape holly, is a native American relative of leatherleaf. When pruning to control a plant's size or shape, cuts should be made just above a leaf bud and at a slight angle. Adding color and splendor to the shade garden, Mahonia aquifolium (Oregon Grape Holly) is a striking evergreen shrub with multi-season interest. The Latin name for this plant species is Mahonia aquifolium there are 6 species of Oregon grape that belong to the Berberidaceae family. Pruning Oregon grapeholly. Lightly fragrant, they attract pollinators before giving way to clusters of dark blue-purple, edible berries in late summer. Why not read Winter Blooming Shrubs: The Short List by Jacqueline Cross for ornamental alternatives to leatherleaf? In spring, racemes of cheerful, bright golden-yellow flowers appear just above the leaves. Pruning Instructions. Control height and form by pruning; if woody stems jut out, cut them down to ground (new growth fills in quickly). Mahonia aquifolium The Oregon Grape, or Holly Grape, as they are also called, are evergreen shrubs that are native to the Pacific Northwet. It is a standard-size Mahonia, not a compact variety. Use in masses as foundation planting, in woodland garden, as low screen or garden barrier. Oregon grape holly can take any exposure, though it does best with some shade in the Lower South and wind protection in the Upper South. It also is frequently planted as an ornamental, for it's dark blue berries, holly-like leaves and small yellow flower clusters. The Garden In Win ter by Larry Rettig suggests many other ideas for winter interest. Other common names for Oregon grape are mountain grape, holly-leaved barberry, Oregonholly grape, and Oregon grape holly. And year-round visual interest is a guarantee. Oregon grape is native to western North America and is the state flower of Oregon. They have leathery, compound leaves consisting of 5-9 Holly-like leaflets on each side that emerge with a nice reddish-bronze color in spring, before turning to dark green. From mass plantings in your flower beds to colorful screens along your driveway, the Oregon Grape Holly Shrub serves as a one-of-a-kind evergreen shrub that does it all. ... 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