how can i slow plant growth?

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I think you are safe. The preflowers will do that if you have been vegging them for long periods. The good thing is that stressing the plants while they are in veg rarely affects them to cause hermy issues. The key is the lighting. The problems occur when the lighting is changed enough to cause the sex hormones to change. As long as they are under 24hr lighting, you can nearly run them down with a lawn mower and they will come back.
 

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