smoke24answered grow question 4 years ago Bleach will not only affect plant growth, but will most likely kill a plant altogether. While chlorine in small doses is harmless or even beneficial to plants, concentrated chlorine such as bleach will destroy a plant and the network of life that plant depends on to obtain nutrients and thrive. Bleach is not good for plants. However if you want to use a toxic chemical on a plant that you will later be consuming, then by all means go for it. As for me I'll stick to smoking bleach free weed. Enjoy.