Spraying your plants with just plain water at any point in their life is useless. If you want to Foliar feed, do so in veg. I avoid sprays of any kind near my plants, but I understand if people need them in veg. Any sprays near buds is just unnecessary IMO. FWIW, an ASPRIN dissolved in a gal of water is a great Foliar spray to boost plant health. It works for sure, if you have an unhealthy plant in veg....give it a try. Better than most of the crap you buy bn the store and you know what you are giving your plant. I don't want residuals on my flowers, and some stuff sticks around. I remember my friend using Neem oil in late veg. It knocked his bugs away, but his buds smelled and tasted weird.