Can I divide my Calla lily? When should I do this?
According to Sunset Western Garden Book (2007), Calla lily (Zantedeschia) should only be divided if it shows signs of decline. The Royal Horticultural Society suggests dividing in spring, if needed:
“Propagate by division, in spring. Small rhizomes that have been overwintered in pots under cover can literally be cut up into sections, each with a visible bud.
Large overwintered clumps in the garden can be divided in the same way as other perennials, by lifting the plant before there is much top growth, and chopping through the roots with a spade and dividing into smaller sections.”