Masterblend 10-30-20 Blossom Booster MASTERBLEND 10-30-20 is specifically designed for use as a blossom booster for Orchids, but it should not be limited to just one plant species, It will work very well on all types of flowering material, especially when the grower requires improved bud set, bud count, and better color and size of flowers. Use MASTERBLEND 10-30-20 throughout the flowering stage; then switch back to 20-20-20 General Purpose when flowering is finished. Works well on all plant materials—especially effective on indoor foliage plants. A great fertilizer for any blossoming plant. It helps make nutrients available for the plant. It will also promote great root growth for new plants. Great to use on just transplanted tomato or pepper plants for root growth.