This will improve air circulation throughout the shrub and reduce the opportunity for disease and insect damage. Oregon grape holly (Mahonia aquifolium) is a handsome, 3- to 6-foot ornamental shrub that can play a number of roles in the garden. The upright flower racemes are 3in long and appear in early to mid autumn followed by dark blue berries. Mahonia x media – with typical bright yellow, fragrant flowers from late autumn to late winter.It looks particularly good at the back of borders; Mahonia aquifolium ‘Apollo’ – a compact cultivar, that grows in a neat spreading dome.The glossy, dark green leaves, flush purple in winter with the characteristic yellow flowers appearing in early spring, followed by blue-black berries Family Berberidaceae . Mahonia care and adice - Mahonia are typiacly grown for there attractive dark green foliage which are made up of long leaves consististing of around 5-20 leaflets depending in the age of the growth. Mahonia aquifolium typically grows quite a bit larger than that, often reaching six feet tall and about four or five feet wide. The shrub’s appearance changes with the seasons. 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. Pruning back the foliage in the spring, as you’ve been doing, is the perfect thing to do. Mahonia aquifolium 'Apollo' Mahonia fortunei is an upright shrub growing to 4 or 5ft with 8in long leaves which have up to 13 leaflets. Genus Mahonia are evergreen shrubs with leathery, pinnate leaves which are often spine-toothed, and clustered racemes of sometimes fragrant yellow flowers, sometimes followed by black or purple berries 1. It is hardy to zone (UK) 5. The plant is self-fertile. Assuming that the species you have is Mahonia aquifolium, and that the 3.5' x 9' size refers to a colony of multiple stems, I'd say you should prune the center down to 6" or so only in the area you need in order to plant the new plum. Planting and Care. Mahonia aquifolium, the Oregon grape, is a species of flowering plant in the family Berberidaceae, native to western North America. Then, observe how the Mahonia reacts to this reduction while the plum is getting established. Water leatherleaf mahonia shrubs deeply the morning before pruning them so the stems and foliage are well hydrated. Other common names Oregon grape 'Apollo' . They are a evergreen shrub and from around late autumn through to winter they then produce long stalked bright yellow flowers which shoot out from the ends of leaves Mahonia aquifolium is an evergreen Shrub growing to 2 m (6ft) by 1.5 m (5ft) at a fast rate. It is in leaf all year, in flower from January to May, and the seeds ripen from August to September. A mahonia rarely seen here is Mahonia aquifolium, commonly called Oregon grapeholly, as it's native to that state. Mahonia aquifolium is a species that is commonly grown in smaller gardens or patio beds as it is much more compact than many of its relatives at up to 1.5m tall, while still being upright and bushy if grown in its favoured semi-shaded conditions. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. It grows best in zone 8 and farther north, so it's only an option for those in the Florida panhandle. In spring the branches bear long, hanging clusters of lightly fragrant, yellow flowers which give way to dark blue berries in summer. Mahonia can be planted in North and Central Florida gardens in areas with full or partial shade. Mahonia is very tolerant of pruning so don’t be afraid to do this including pruning out some of the older branches right back to the ground. 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