Do Lilium Bulbs Multiply?

Lilies are cold hardy in zones 4-9, so the bulbs may be left right in the garden for the entire winter. Over time, most lily bulbs will multiply and the plants will grow into large clumps with many stems. Lily bulbs don't mind being crowded and it's rarely necessary to divide them.

Do lilies spread on their own?

When cared for and left to themselves, lilies will quickly spread out and can fill a garden bed over the period of a few seasons. When a gardener intervenes to propagate them, the process is accelerated and new plants can be strategically and deliberately placed. Early fall is a good time to propagate lilies.

How fast do lily bulbs multiply?

They are considered perennials and grow in U.S. Department of Agriculture hardiness zones 2 through 9. Lilies develop from bulbs that multiply every two or three years. Some varieties grow slower than others and may not need division as often as other types of bulbs.