In my last column I forgot to mention how wonderfully long-lasting Gloriosa superba lilies are, both on the vine and as cut flowers. Next I'd like to discuss the toxicity of the tubers, hints on propagation, nomenclature, and a few sources for these great plants. The L-shaped tubers are extremely poisonous, containing the powerful alkaloids colchicine and gloriosine. Accidental death due to ingestion has occurred in Third World countries where some people have mistaken them for the edible sweet potato, Ipomoea batatas.
Common sense dictates the wearing of gloves when handling tubers.
In its native India, Gloriosa superba has become endangered due to overcollection of the tubers, which are an ingredient in the Ayurveda treatment of gout. Several Indian companies export the marble-like seeds as medicinals. Propagation is by division of the tubers or from seed. Gloriosa bulbs should be divided every third year. I prefer to do this in early spring, just before new growth begins, when the eyes are easiest to spot.