Dear Cyndi: Cymbopogon citratus is a tropical plant rated to zone 9(20F min wtr temp). My lemon grass purchased this spring in a 2" pot has advanced into a gallon sized pot. The culms are really growing tall and the plant that's still in the greenhouse looks quite healthy. But at this size it certainly couldn't sustain a household's taste for lemons. I'm letting my plant grow for a while before harvesting. Do we cut the culm back to its origin or half way up the blade of grass? I think the little plastic packages of lemon grass in the grocery store must come from a huge plant. Best, Vicki