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Lemon grass needs space for roots. If you put it in a small planter you get small plants.
In the past I have used grocery store lemongrass stalks to grow new plants. The 1st step is cutting about 5 inches of the top off and using for seasoning, tea or throwing it away. Next slice a thin slice off from the bottom with a razor then gently peeling off 2 leaves down to the bottom where it attaches to the root stalk. You want to make sure the piece of lemongrass you buy has the woody stalk. If you can see rings of plant on the bottom it has been trimmed too much and is useless for planting. Put what is left after trimming in a clear glass of water near a window and watch it grow. You will notice growth in the middle on top first then small offshoot leaves followedby roots. Once you have some roots of about 2-3 inches you can plant it in soil. If you are in a warm climate you can plant it outside if it is still cold keep it indoors until it warms up.This technique has given me large plants 3-5 feet tall and 3 feet in diameter. I get healthy large plants in large planters.
At the end of the season I have to clean out the pots and refill with new soil. Nothing will grow in the pots with the roots left in them. I was surprised by the compaction of the roots. I tried reusing the pots with the soil and it was a disaster. The plant was root bound in a few weeks. I tried cutting the roots up but it was again useless. Lemongrass has a massive tough root system.
I use lemongrass as a privacy screen for my patio. It is wonderful and keep mosquitoes away.
This year I am trying seeds for the first time. Happy growing.
