Adenium grows wild across the dry expanses of sub-Saharan Africa and the Arabian Peninsula, where its swollen, water-storing caudex allows it to endure droughts that would end most plants. In cultivation, that same caudex — sometimes growing twenty to thirty inches wide and forming fantastical sculptural shapes over decades — is the source of its appeal as a bonsai and specimen plant. In zones 10 and 11 it can reach fifteen feet in the garden; elsewhere it is a container plant to bring indoors before night temperatures drop to 55°F. Inside, place it in the brightest available light and reduce watering as it goes dormant, which may involve dropping its leaves entirely. Resume normal water when foliage begins to regrow.

The flowers are the other attraction: two-inch wide, tubular blooms in pink, red, white, and variegated forms that bear a clear family resemblance to Mandevilla, a distant Apocynaceae relative. A sandy or gravelly, sharply draining potting mix is non-negotiable; wet soil invites root rot in a plant evolved for exactly the opposite conditions. The leaves and stems contain a milky latex that can cause skin rashes and must be kept away from eyes; no part of the plant should be ingested. Propagation is from seed or cuttings, with the most desirable cultivars grafted. For anyone with a genuinely hot, sunny patio or sun-drenched windowsill, Desert Rose offers a concentrated tropical grandeur that few other plants can match.