Calla lilies (Zantedeschia) are native to warm, tropical regions. Temperate climates like zones 7a and 7b may get too cold for them to survive outdoors.

Plant Calla lily bulbs in spring, after the danger of frost has passed and the soil has warmed up. This is usually around mid to late April to early May, depending on your specific location. The soil temperature should ideally be about 60°F (15°C) for optimal growth.

To store over winter, shake off excess soil, but don't wash the bulbs with water because moisture can lead to rot during storage. If the bulbs have any dirt stuck to them, let them air-dry a bit. Allow the bulbs to dry out in a cool, dry place for a few days (usually 3-5 days). This helps prevent mold and mildew. Place the bulbs in a breathable material, such as a mesh bag, paper bag, or a cardboard box. Store them in a cool, dry, and dark place. A basement or garage is ideal, with temperatures between 40°F and 50°F (4°C and 10°C). Avoid storing the bulbs in damp areas to prevent rot. Throughout the winter, check on the bulbs every few weeks to make sure they’re not rotting.