Calla Lily (Zantedeschia) Indoor Care and Dormancy Cycle

Diagnosis: Overwatering + Low Light = Rot

The speckled, jelly-like leaves, moldy soil, and foul odor mean root rot from overwatering in low light. Calla lilies are bulbs (rhizomes) that need full sun to fuel the bulb and a dry dormancy period.

Immediate Action

1. Move to full sun outdoors (patio, deck) or sunniest window.
2. Spray soil surface with Lysol to kill surface mold.
3. Water only when soil surface is dry. Deep soak, drain saucer.
4. Fertilize with high-phosphorus formula (10-30-10 or 20-50-20) to feed the bulb.

The Dormancy Cycle (Key to Rebloom)

1. After flowers fade, keep in sun to recharge bulb (6–8 weeks).
2. When leaves yellow, stop watering completely.
3. Let pot dry out fully. Remove dead foliage.
4. Store in a brown paper bag in a cool, dark closet (50–60°F) for 3 months.
5. Check weekly after 3 months. When sprouts appear, bring out, water, and resume sun + fertilizer.

Can It Stay Indoors Permanently?

Only if you have a very bright, sunny window (south-facing, unobstructed) and you strictly follow the dry dormancy. Most indoor conditions are too dim and humid for long-term success. Outdoors in summer is strongly recommended.

Hardiness Note

In zones 8+, callas can stay in ground year-round with mulch. In colder zones, lift bulbs in fall or grow in pots that move indoors for dormancy.

Your plant isn't dead—it's rotting from kindness. Sun, drainage, and a proper rest period will bring it back stronger next season.