I had never had success with calla lilies until recently. I always managed to make them die. Quickly. Apparently, the key to success is ignorance. Over the fence, my neighbor gave me root cuttings one afternoon. The only empty pot I had didn't have any drainage holes but I filled it with soil, threw in the cuttings and hoped for the best. Then I left on holiday for two weeks. When I returned I was stunned the plant was still alive and better yet? Growing! Then January and February were filled with rain which constantly made my drain-less pot overflow and sit with lots of water. I would pour off the excess water and shake my head certain the lilies would rot. The plant didn't rot, but thrived. Come spring, I have been rewarded with bloom after bloom and am amazed with its beauty.