Euphorbia decaryi var. spirosticha

Adapted to the hot, distinct wet-and-dry seasonal cycles of southern Madagascar, this geophytic succulent is an active summer grower. In a coastal Zone 10b environment, it thrives outdoors under the protective diffusion of shade cloth, which brings out the rich, bronzed stress coloration of its crinkled leaves without scorching them. Because of its fleshy, spreading root system and semi-subterranean stems, it is highly susceptible to rot if left in cold, wet soil. It demands an uncompromisingly fast-draining mineral substrate—such as your standard gritty blend of 80% volcanic pumice cut with calcined clay and coarse decomposed granite. Cultivating it in a wide, shallow, breathable raw cement pot is ideal, as it accommodates the plant's creeping habit while rapidly wicking away excess moisture. Water deeply during the peak summer heat when active growth occurs, ensuring the soil dries out completely between applications, and enforce a strict, dry dormancy throughout the cool winter months, keeping it safely shielded from unpredictable seasonal rains beneath a solid polycarbonate roof.