Why does my blood lily not flower?

Question

Has been in a pot for some years, large, healthy leaves. Has full sun, fertilizer in spring (usually osmacote). I also have a plant in the shade, equally large, strappy leaves.

Answer 1

When plants don't flower, the two most likely reasons are not enough sun, and too much nitrogen. Doing some research on these spectacular plants, I see recommendations for open potting medium similar to orchids; partial (50%) sun, and keeping them pot-bound. This article might give you some ideas: https://www.gardeningknowhow.com/ornamental/bulbs/blood-lily/how-to-grow-african-blood-lily.htm