Mahonia aquifolium - the Oregon-grape - is a species of flowering plant in the family Berberidaceae native to western North America.
It is an evergreen shrub growing to 1 m (3 ft) tall with pinnate leaves consisting of spiny leaflets, and dense clusters of yellow flowers in early spring.
Sowing & planting
60 - 300
6 - 8
Plant my oregon-grape
Mahonias are undergrowth shrubs, so they prefer this type of situation. Plant from late autumn to early spring, in shade or partial shade, in drained soil.
Make a hole twice as large as the root ball, without mixing the layers of soil - you will put them back in order at planting.
Put back some of the earth from the bottom, and place your mahonia at the right depth. Do not bury the base of the trunks, and fill with the rest of the soil while tamping regularly around the roots.
Form a "bowl" of earth around the plant and water until the water no longer flows visibly. In a tank, choose a small-growing species and plant in a mix of loam and compost on a bed of gravel.
Water my oregon-grape
Water thoroughly for the first few weeks after planting! Afterwards, you can space out watering to once a month. In following years, cease watering. This plant is indigenous and adapted to temperate climates.
Mulch my oregon-grape
Mulch in November each year with deciduous wood chips to protect the soil — especially for the first few years — and limit the need for weeding.
Prune my oregon-grape
The trimming of mahonias must be light, it is only intended to lighten them slightly. It should be done after flowering, as early as March.
In the early years, trim the tips of stems to force them to branch - and densify the shrub.
Then, once your mahonia adult, conversely you will only trim the branches that overlap, those that are damaged, and possibly dry flowers.