Chlorine is a poison and isn't good for plants, although if you don't have enough chlorine in the water, it won't kill them but just slow their growth.

Chlorine is toxic to plants when it is in high concentrations. Some plants can die if they are exposed to chlorine gas; there are plants particularly vulnerable to chlorine damage. However, chlorine in low concentrations is good for plants because it kills bugs that are not beneficial for certain types of plants.

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