I went to a health day event and I found out that you can do it. I imagine you want to use any of the Seventh Generation laundry products in your wash, because it is safe for the environment and to animals. Most importantly, it uses plant-based products. So if you want to water your plants with your water from the laundry, I would use their products to ensure that the water is safe. If you are still unsure, call Seventh Generation and ask them. I hope I have been helpful.