Would rain water be a good source of water for indoor plants? I have always ph’d tap water; however, I have two rain tanks that I use for my outdoor tomato garden and was curious if rain water works well with cannabis. My tomatoes love it.
You can use it , you need to ph'd it like any water ( except if the ph range fits with your kind of grow ) and dn't frget that it's cal/mag free s you'll have to increase the dosage