Maya I've had this, too. But it's not always herbicide. I bought a seedling and kept it in the house for about a month. At some point it began to grow curled leaves. I cut them off and the replacement leaves were also curled; eventually I threw it away. I've had others that I grew myself and planted out; some got curly tops. Cutting off 3" more than the curly part allowed some of them to grow correctly; others didn't. It happens occasionally and randomly in my garden. One plant will be curly and all the rest surrounding it will be fine, so probably not herbicide. (Also, my neighbors near the garden don't spray). I've never found any bugs, and don't know the true cause, but since it's rare, I just pull any plant that gets it too bad.
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