Lemongrass grows quickly and spreads to fill a planting bed or pot. Expect a plant to reach a size of 3 to 5 feet tall and up to 2 feet wide in a growing season. … Use too small a pot, and lemongrass roots will likely break it. With ample water and fertilizer, these roots bulk up and spread out.

Are lemongrass roots invasive?

The clump size grows as they mature, but it’s hardly considered invasive. Propagate citronella by planting the lemongrass seed or division. Start propagation in early spring by splitting large clumps into smaller clusters and replant them in other spots or containers.

Does lemon grass multiply?

Lemongrass stalks multiply and should be divided every few years. Share extras with would-be lemongrass-growing friends. The best time to divide lemongrass is in the spring after your last frost date.