In the garrigue region of the Languedoc, alkaline soil prevents growing plants and shrubs which prefer acid soil (e.g. rhododendrons, azalias, camelia, Japanese maples, i.e. acer japonicum etc). The magnolia is a borderline case. Some, such as the magnolia grandiflora, which eventually becomes a large tree, will grow without problems in alkaline soil. Some others such as the magnolia stellata are marginal.