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Your cart is empty.10 Lemongrass Stalks Ready to Plant, Mosquito Repellent, Citronella. They are fast growers. When the leaves grow tall, you can cut them to use for cooking or making tea. They will sprout again from where you cut the stalks. Steps in Rooting Lemongrass Stalks in Water: 1. Place the stalks in a jar or vase with about 2 inches of water for about 1 week. 2. Keep in a warm place or in a sunny location like a south facing windowsill. 3. Change water every 2 days or when the water gets cloudy. 4. They will start to sprout new leaves and the roots will start to grow. 5. Plant the whole stalk at least 2 to 3 inches deep. Whe they grow taller, you can cut the stalks leaving at least 5 inches above the ground. They will sprout new leaves from where you cut them.