4b Star Magnolia is a dense large shrub or small tree that is grown primarily for its extremely showy pure white flowers. It blooms in early spring before the leaves emerge. Leaf color is an attractive medium to dark green in summer and turns yellow in fall. Plant form is oval to round headed. In northern areas, Star Magnolia should be planted in protected microclimates since they're marginally hardy.
Flower buds are marginally cold hardy in northern areas.
Flower buds are also often killed by frost since they bloom very early in the spring season. Not tolerant of high soil pH. No serious insect or disease problems. Royal Star'- has large white flowers. Waterlily' - buds pink, open to white. Plant more upright and shrub-like than the species.