1. Understanding Calla Lily Growth Cycles
Calla lilies (*Zantedeschia spp.*) are perennial plants that thrive in temperate climates. Their growth cycle consists of active growth, flowering, and dormancy phases. Transplanting should align with their natural rhythms to minimize stress. The ideal time is during dormancy, typically in late fall or early spring, when the plant is not actively growing or flowering. This allows the roots to establish before the next growth phase.
2. Choosing the Right Time for Transplanting
The best time to transplant calla lilies depends on your climate:
- In colder regions: Transplant in early spring after the last frost, as the soil warms and new growth begins.
- In warmer regions: Late fall is preferable, allowing roots to settle before winter rains or mild temperatures.
Avoid transplanting during flowering or peak summer heat, as the plant may struggle to recover.
3. Preparing the Transplant Site
Calla lilies prefer well-draining, fertile soil with partial to full sunlight. Before transplanting:
- Test soil pH (aim for 6.0–6.5) and amend with compost or organic matter.
- Ensure the new location has adequate space (12–18 inches between plants) to accommodate rhizome spread.
- Water the original plant thoroughly a day before digging to reduce root shock.
4. Digging Up and Dividing Rhizomes
Calla lilies grow from rhizomes, which can be divided during transplanting:
- Gently dig around the plant, keeping a 6-inch radius to avoid damaging roots.
- Lift the rhizome cluster and shake off excess soil.
- Inspect for healthy, firm rhizomes with at least one "eye" (growth node). Discard soft or rotten sections.
- Use a sterile knife to divide rhizomes, ensuring each division has roots attached.
5. Replanting Calla Lilies
Follow these steps for successful replanting:
- Dig holes 4–6 inches deep in the prepared soil.
- Place rhizomes horizontally with eyes facing upward, covering lightly with soil.
- Water deeply to settle the soil and eliminate air pockets.
- Mulch lightly to retain moisture and regulate temperature.
6. Post-Transplant Care
To ensure recovery and growth:
- Keep soil consistently moist but not waterlogged for the first 4–6 weeks.
- Avoid fertilizing until new shoots emerge, then use a balanced fertilizer monthly.
- Monitor for pests (e.g., aphids) and diseases (e.g., root rot), treating promptly if needed.
7. Signs of Successful Transplanting
Healthy calla lilies will show:
- New leaf growth within 2–3 weeks in spring or after winter dormancy.
- Strong stems and vibrant foliage without wilting or yellowing.
- Flowers appearing in the next growing season if transplanted correctly.
