When to plant
Plant Zantedeschia in spring, once frost has passed and the soil has warmed to at least 12°C. In colder climates, start indoors and transplant after danger of frost.
Where to plant
Choose a location with full sun to partial shade. In warmer climates, callas benefit from some midday shade. The soil should be moisture-retentive yet well-drained — ideal near pond edges, in rich borders, or in containers with good drainage.
Preparing the soil
Loosen the soil to about 20–25 cm deep and work in compost or organic matter. Improve drainage with coarse sand or grit if the soil is heavy or tends to hold water.
Planting the rhizomes
Lay the rhizomes horizontally, with the growing points facing up. Cover with about 5–8 cm of soil. Space them 20–30 cm apart depending on variety and desired fullness. In containers, cluster closely for a denser visual effect.
After planting
Water thoroughly after planting to settle the soil and initiate root development. Keep the soil consistently moist but not waterlogged. Avoid dry spells during early growth.
During growth
Once shoots appear, feed monthly with a low-nitrogen, high-potassium fertilizer to support flower development. Water regularly, especially during hot periods. If grown in containers, ensure excess water can drain freely.
After blooming
When flowering finishes and foliage begins to fade, reduce watering. In frost-prone areas, lift the rhizomes before the first frost, clean and dry them, and store in a cool, dry place. In mild climates, they can be left in the ground with a protective mulch.
Extra tips
Zantedeschia make excellent cut flowers — harvest when the spathes are just opening. They thrive in moist garden borders, alongside hostas or ornamental grasses, and also shine as container specimens. Rotate container plants annually to refresh soil and boost bloom quality.
