Posted: 09/06/2014 at 11:52
There are several species of mahonia, Mahonia media and Mahonia japonica both form an upright shrub, and are the varieties most commonly used in gardens. Mahonia aquifolium is a shorter, spreading shrub which does send up shoots all around, and can be a bit more troublesome. Also called Oregon Grape.
Mahonia japonica is what most of us have - the US Mahonia (a decent evergreen shrub but Holly Osmanthus gives the same foliage effect with more elan) is a different species and is the invasive one.