How do you replant Romaine lettuce?
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You can grow it from what you buy at the grocery store and if you cut it, it will regrow on its own.
Here's a step by step tutorial on regrowing Romaine lettuce: https://www.gettystewart.com/how-to-regrow-romaine-lettuce-from-the-stem/
If you cut the end off the Romaine lettuce, you can replant it in water to get it rooted. After it has good roots put it in a planter in soil. It likes cooler air so 100 deg heat won't allow it to grow, so I grow mine inside in the heat as we have a/c on all summer. It likes lots of sunshine and cool air!