I use r/o water and I use 1 teaspoon per gallon every watering and I may up it a little if I see signs of a deficiency. I use it during flowering too. It doesn't have enough Nitrogen in it to affect flowering negatively.
I suppose it depends on your plants. I find that I've definitely needed it throughout this grow with white widow. I only used it a couple of times last grow. If your plants are looking good why add extra stuff?
I suppose it depends on your plants. I find that I've definitely needed it throughout this grow with white widow. I only used it a couple of times last grow. If your plants are looking good why add extra stuff?