In colder areas crinum is usually grown in big containers, because the bulbs grow quite big. The containers can be placed outdoors or located in spacious holes in the ground but always in full sun, where the crinum will grow and wait for the autumn to come. When it happens, the containers should be transported into well lit sheltered places for the winter time. Some of the leaves usually turn yellow and eventually die, but still they should be left on the plant until new growth appears in the spring. All these procedures are unknown to the inhabitants of mild and warm climatic zones where crinum once planted can be left undisturbed for centuries.
Crinum x powellii is a hybrid which normally blooms in late summer or early autumn but it is not always like that. Sometimes flowers can appear early spring before the new leaves emerge. The weather conditions influence the flowering time as well as the dormant period which usually coincides with our winter season. Crinums grown as house plants will bloom more irregularly than those grown as partially garden kinds. No mater the way they are grown, they require rich garden soil, moist but well drained. The mother bulbs form new small bulbs at the base. They are a natural start for new craniums. It is a good idea though, to let the roots become crowded in the pot before we decide to separate new bulbs from the old one as crinum grows and flowers better when the container is rather tight for the roots, from our point of view.
Crinums make perfect cut flower. We should be cautious while cutting the flower stems off as the sap has some irritants the skin can be allergic too. As a matter of fact the whole plant is considered to be toxic and my suggestion is to use only our eyes and nose for flower contemplation. Even the most beautiful crinum is inedible, what a shame!