Benzelsanswered grow question 3 years ago Professors Nutrients -Flower Boost organic. I use the Synthetic Veg and Bloom boosters and they are brilliant. The bloom booster synthetic is a powder and its cheap and works well so id say the organic would be just as good but its a liquid.
Green House feeding does good powder synthetic lines too for their boosters and base nutes- I love their base nute lines, but they only have powder organic base nutes and no bloom boosters.