Not really bothered what colour the plant is. I have just joined GreenPlantSwap.
Plant in the autumn about 10-15cms deep, you will need to protect with bracken, loose peat or similar during first winter, if frost is expected. Feed with slow-acting fertilizer such as bonemeal in the summer. The corms are best left undisturbed to form clumps before the frosts. They are half hardy and will require an open, sunny position with light, well drained soil.
Propagate by seed in autumn or division of clumps.