The genus Fenestraria is found in the winter rainfall region of southeastern Namibia into the Richtersveld. The dwarf plants form mats or small clumps in sandy soil. The leaves are flat-topped and windowed, with generally only the uppermost portion exposed in the wild. They possess thick, fleshy roots. Fenestraria prefer sandy soil and should be watered sparingly at all times to avoid root rot and split leaves. They need to be kept somewhat dry in the summer. They are usually propagated by seed but sometimes by cuttings.