Not all bulbs are dug. Our first pink crinums were a gift from a friend. Fours years ago, we planted rows of this flower in an abandoned sweet potato field that is now our farm. Then we walked away. Four years later, the bulbs had turned into large clumps of five or more bulbs and sent up two to three bloom stalks every year. They compete with the weeds, hogs, and grasshoppers, using nothing but the natural rainfall to survive.
Crinum powellii comes in two different colors, pink and white. It is one of the most cold hardy of all the crinums, but that in no way means that it cannot stand the heat. Some of the toughest, oldest crinums we have are Crinum powelii. I was in South Carolina at a plantation where I saw one blooming in the middle of a VERY hot and humid day. We also grow a white form that we have from the original home of a Texas Revolutionary War fighter who moved the crinum from his original home in Georgia.
During the winter, as most crinums do in colder areas, the foliage will die down completely. This opens up an opportunity to plant other winter growing bulbs to hide the foliage and barren stalks of the crinum. Lycoris radiata, Narcissus tazetta Grand Primo, and other strong winter bulb foliage plants are good choices and allow you to pack in more color into more spaces.