Propagation is mainly by division. Separate one or more slips from the clump along with the rhizome (root) material from the parent plant. Trim the leaf material to about 10 inches from the root. Clean the root material only to a small part of the rhizome. Plant the slips 4 to 6 inches deep in the ground about 1 foot apart, or in a pot with good compost or potting soil. Keep the soil moist for a few weeks after planting. Lemongrass can be propagated by seed, but it is not common. Only put a sprinkling of soil over the seeds, as they need plenty of light to be able to germinate. Seedlings can take up to three weeks to emerge, and youa ll need to keep the soil moist during this period. The lemongrass (Cymbopogon citratus) is a perennial, however, it is winter hardy and very much sensitive to frost conditions. The first harvest of lemongrass can be expected after 4 months of planting. Lemongrass is recommended to plant after the frost is passed. Usually, lemongrass will become dormant in cold conditions like cold winters. Lemongrass can be grown in pots in the home garden. Lemongrass requires full sun or partial shade and prefers warm, humid conditions.