How to Plant Calla Lily in Pots | Pot Depth, Spacing & Care

Plant calla lily rhizomes in a 10–12 inch pot with drainage holes, using a well-draining soilless mix at a depth of 3–4 inches with the eyes facing upward, then water sparingly until shoots appear about two weeks later.

A potted calla lily that refuses to bloom or rots at the base is almost always a planting-depth or drainage problem — and the fix lives entirely in the first five minutes of setup. Calla lilies (Zantedeschia) thrive in containers when you get three things right: the pot size, the soil structure, and the rhizome’s orientation. This guide covers the exact planting sequence, the common mistakes that kill them, and how to keep your potted calla blooming through the season.

Choosing the Right Pot and Soil Mix

The container must be at least 10–12 inches in diameter with drainage holes. A 6-inch pot works only for the smallest dwarf varieties. A quality soilless mix — one that’s 70–90% coarse material like coir, rice hulls, pine-bark compost, or sand — provides the sharp drainage callas need. The soil pH should sit between 5.8 and 6.2; add lime if your mix tests lower. Fill the pot two-thirds to full with this mix before planting.

Step-by-Step: How to Plant Calla Lily Rhizomes in Pots

1. Prepare the pot and soil. Confirm your container has drainage holes, then fill it with your soilless, well-draining mix. 2. Dig the hole. Make it 3–4 inches deep. Some rhizome guides recommend only 1 inch deep for certain types, but 3–4 inches is the reliable general rule for potted callas. 3. Place the rhizome. Set it horizontally with the eyes (growing tips) facing upward. Cover the crown with ½ to 1 inch of soil. 4. Water sparingly. Give the pot a thorough watering right after planting, then keep the soil only slightly damp until leaves unfold. Overwatering at this stage causes rot. 5. Increase watering after shoots appear. About two weeks after planting, when green shoots emerge, begin watering to keep the soil consistently moist but never soggy. 6. Begin fertilizing. Apply a balanced fertilizer like 10-10-10 or 5-10-10 every 3–4 weeks in spring and summer. Add slow-release bulb food at planting, then switch to a liquid bloom fertilizer 1–2 months later. Stop fertilizing when blooming finishes.

If you’re picking a pot and shopping for varieties, our roundup of the best calla lily containers and growing kits can help you match the right container size to each rhizome type.

Spacing, Light, and Temperature for Potted Calla Lilies

Spacing: Place rhizomes 4 inches apart in the pot, or 1–2 inches apart if they aren’t touching. Max three rhizomes per 12-inch pot. Sunlight: Give potted callas full sun to partial shade. In hot climates, provide afternoon shade. Indoors, they need very bright indirect light. Temperature: keep the pre-sprout environment at a constant 65°F with 80–90% relative humidity. Once growing, aim for day temperatures of 60–75°F and night temperatures of 55–60°F.

After Bloom: Winter Care and Dormancy

In Zone 10 and warmer, you can leave calla lily tubers in the pot year-round; mulch in fall for protection. In cooler zones, wait until the foliage yellows, then dig up the tubers and store them in slightly moist peat moss at 50–60°F in a dark place for winter dormancy. Always trim faded blooms after flowering, because the plant wastes energy trying to produce seeds on dead flowers.

Safety note: Calla lilies contain calcium oxalate and are toxic if ingested. Keep pots away from children and pets, and wear gloves when handling the rhizomes.