(At the worst, it might not bloom for a year). Hedge shears. Create a lighter, airier appearance by thinning several lateral branches each spring. The Oregon grape (Mahonia aquifolium) is a broadleaf evergreen shrub that grows well in shadier spots.It originated in western North America and is the state flower of Oregon. There are several tools that you will need to perform your pruning or trimming of a clematis montana. Some gardening advice suggests pruning out one third of the branches annually to prevent the shrub becoming bare. Pruning a Mahonia Mahonia are best left unpruned if possible but there are instances when you may want to prune a Mahonia shrub. Put on heavy leather gloves and a thick long-sleeved shirt before pruning leatherleaf mahonias because their leaves are extremely spiny and sharp. Before you prune your Berberis, get a tough pair of gloves! Two photos show it as of 5/4/2015. Cutting off all the stems and leaves is a huge stressor to the plant so it’s best not to do it too often or you’ll risk weakening the shrub, making it more susceptible to disease and pests. If your garden is large, with enough space to let these trees grow freely you probably don’t need to prune them. Prune branch tips back to increase density and direct the plants growth. ... Prune anytime to correct vandalism damage and hazards created by equipment or weather 3.) How to Prune Spirea. Never deadhead the spent flowers because blue-colored fruits will develop on the stalk, and these are an important and favored food source for many species of birds. Mahonia, commonly referred to as Oregon grape, is an evergreen shrub with dark blue berries and glossy, leathery leaves. I'd like to prune back the longest branches, if this advisable, or is pruning not a desirable option. 3 ways to prune spirea. 1. There are dozens of species of Mahonia. Cut back to healthy tissues, down to the parent branch or down to the crown of the plant, whichever maintains the natural form of the shrub better. v_zaitsev/getty. According to Purdue University, any significant pruning for shape or size should be conducted in the early spring before new growth appears. It will provide color throughout all four seasons with its green and burgundy foliage, yellow flowers, and purplish-blue fruit. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Keep pruning tools sharp so they make smooth, clean cuts. Mahonia are best left unpruned if possible but there are instances when you may want to prune a Mahonia shrub. You should actually prune your spirea more than once a year, at least twice. How to Prune Spirea. sÃ©cateurs image by Claudio Calcagno from Fotolia.com Mahonia is a genus of flowering and fruiting evergreen shrubs with more than 70 species in it, according to Floridata. Never cut branches back by more than ⅓ their length. Make sure to use ratchet-style pruners and avoid anvil-style. We take you through the process of pruning at the right time, done in the right way. All pruning is best done in late summer, you can prune out any damaged or diseased branches but as disease is not really a issue with Mahonis this is proberly not needed. 10 feet tall, situated in full sun, southwest side of house. The Oregon grape (Mahonia aquifolium) is a broadleaf evergreen shrub that grows well in shadier spots.It originated in western North America and is the state flower of Oregon. How do you prune an overgrown shrub? There are dozens of species of Mahonia. Hard pruning encourages them to send up vigorous new shoots in spring. If O.K. Mahonia is a genus of flowering and fruiting evergreen shrubs with more than 70 species in it, according to Floridata. Mahonia japonica, Japanese mahonia, is a slow-growing evergreen used in landscapes as an accent.