Thunder Bloom Foliar Spray. 1 Gallon VITA GROW THUNDER BLOOM FOLIAR SPRAY. 128 fluid ounces. Mix 1 and 3/4 teaspoon per quart of water. Starting 5 days before switching to bloom cycle spray once a day. Now switch to the bloom cycle. After switching to the bloom cycle, spray once a day for 10-14 days and stop. Mist top and bottom of leaves. Guaranteed to like it or your money back! 4-ounce trial size only. To my knowle... — Ships from Portland, Oregon USA — Free Shipping when ordering $50 or more of qualifying items....more info.