Answer: Callas (Zantedeschia) need good bright sunlight, a well drained soil and yet plenty of water, and also a very rich soil. In the ground they need to be planted fairly deep, say four to six inches. In pots, they need to be about two inches down. If they are allowed to dry out, even for a short time, they may begin to go dormant so be sure to keep them evenly moist. While they are in active growth, use a fertilizer for flowering houseplants according to the label instructions. They also need warm temperatures for flowering, say at least 55 degrees at night and over 70 degrees during the day. They also need a rest period after blooming, so they will cycle in and out of bloom rather than stay continuously blooming -- your indoor callas will rest during summer, your outdoor callas will rest during winter. Finally, divide them when they begin to seem crowded, this can be as often as once a year.
Q&A Library Searching Tips