Magnolia in blossom
Flower bud
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.
Magnolia stellata in flower