Beginner Gardening: Calla Lily is limp and dying, 1 by Carolyn22

Carolyn22 wrote:
Callas are bulbs and will die back at some point and require a rest period. Let the leaves continue to yellow - this will feed the bulbs. When the leaves have died back, lift your callas and check the bulbs for disease. Put your bulbs in a place that is dark and does not freeze.

You will need to start checking your bulbs in a couple of months for new growth. When you see the little nubbies starting on your bulbs, plant or pot up your calla bulbs and you will have flowers.

What is your zone? If your zone is warm enough, then you could grow these outside. In my zone 5b garden, I have to lift mine and overwinter them inside.