When to Divide Nepeta?

Catmint plants will continue to grow and bloom well for years. But if you'd like to divide them to make more plants, all Nepeta varieties respond well to division in the spring. Find a section of the plant with undeveloped shoots and a good root system, and slice it vertically with a spade.

When can I divide catmint?

Wait until early spring to cut it back. To keep catmint vigorous, divide it every three to four years in either spring or early fall. Keep it well watered the first growing season until the plants become established. Some cultivars of catmint can grow quite large.

Can you divide Nepeta?

The plant might die. We divided this Nepeta Six Hills Giant last autumn. ... Even if you cut across a root, the plant will survive providing there is enough extra root around it.