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
'Pinnacle' is a vigorous medium-sized evergreen shrub of upright growth, with glossy pinnate leaves which open coppery-tinted. Flowers bright yellow, in dense terminal clusters in spring, followed by blue-black berries