How to Dig and Store Tender Bulbs for Winter

When frost hits, the growing season ends abruptly for tender bulbs—cannas, callas, caladiums, dahlias, tuberous begonias, gladioluses, and tuberoses, to name the most common. In zones colder than Zone 7, these bulbs will perish if left in the ground. While buying new bulbs each year is an option, many gardeners prefer to save money and preserve favorite varieties by digging and storing them. Here’s a step‑by‑step guide.

The spectacular foliage and flowers of cannas are a highlight in any garden, but once temperatures drop to around 28°F, the leaves brown and the show is over. Dahlias, elephant ears, and gladiolus look similarly spent, signaling it’s time to bring them indoors.

Begin by digging carefully around each plant to avoid slicing into the bulbs. Lift the entire root clump and shake off as much soil as possible. Place the clumps in a dry, cool location (but above freezing) for about a week. If you’re handling multiple varieties, label each clump clearly.

After a week of drying, remaining soil clods will crumble away easily. Don’t worry if a little dirt stays wedged among the roots. Pack the bulbs in dry peat moss or vermiculite inside a sturdy cardboard box. The peat moss slows moisture loss and prevents shriveling. Store the box at about 45°F—never below freezing—in a garage, crawl space, or basement. Warmer temperatures can trigger premature sprouting, which you want to avoid.

If you plan to divide the clumps, wait until you bring them out of storage in spring.