Managing Overgrown Calla Lilies in a Small Garden

The large white calla lily (Zantedeschia aethiopica) is a vigorous spreader that can overwhelm a small Southern California yard. Unlike many perennials, callas aren't pruned back—instead, they're divided when dormant to control their spread.

When and How to Divide

In fall or winter, after foliage dies back, dig up the clump and shake off soil. Separate the rhizomes (thick, fleshy roots) by hand or with a clean knife. Discard any shriveled or rotting pieces. Replant healthy divisions at the same depth, spacing them 12–18 inches apart. Share extras with fellow gardeners—callas are prized passalong plants.

Why Division Beats Pruning

Cutting back foliage doesn't reduce the plant's footprint; the rhizomes continue expanding underground. Regular division every few years keeps the clump manageable and rejuvenates flowering.