Overwintering Cannas and Calla Lilies in a Michigan Greenhouse: Storage Protocols for Zone 4/5

Canna Storage

1. Cut off dead foliage.
2. Brush off soil (do not wash).
3. Bury rhizomes shallow in sand/vermiculite; crown just showing.
4. Mist lightly; store in paper bag (NOT plastic) in cool (40–50°F), dark place.
5. Check monthly; mist if shriveling.

Calla Lily Storage

1. Brush off soil; air-dry in sun 2–3 days.
2. Store in cool (45–50°F), dark, ventilated spot (basement/garage).
3. Peat moss optional; some use custom mixes.
4. Potted dormant rhizomes can root if kept moist at 50°F.

Commercial Protocol (Optional)

Fungicide dip (Kocide), cure 3–7 days at 70–80°F with air movement, store on mesh trays at 45–50°F for 2+ months. Home gardeners can skip fungicide — curing + airflow is key.

Spring Wake-Up

Pot up 4–6 weeks before last frost. Warm, bright, moist. Plant out after frost.