Dividing Calla Lilies in Arizona: Fall Dormancy Method

An AZ gardener had 3-year-old calla lily clumps with massive leaves but fewer blooms. Needed division/feeding advice.

Arizona Cycle

Callas in low desert (Phoenix, Tucson) often bloom fall/winter and spring, going dormant in summer heat.

Division Protocol

1. Timing: After spring bloom finishes, as leaves yellow (late spring/early summer).
2. Dig: Lift entire clump. Wash soil off rhizomes.
3. Separate: Break/cut rhizomes at natural joints. Each piece needs roots and a growing point (eye).
4. Cure: Air-dry cut surfaces 1–2 days in shade.
5. Replant: 6–8" apart, 2–3" deep. Amend soil with compost.
6. Water: Lightly until new growth, then regular.

Feeding

• Bone meal or bulb fertilizer at planting and early spring.
• Compost top-dress annually.
• Avoid high nitrogen.

Summer Dormancy Care

• Stop watering as leaves die.
• Mulch lightly.
• Resume water in fall when new shoots appear.

Division every 3 years prevents overcrowding and restores bloom. AZ summer dormancy is natural—don't fight it.