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You can use it to the end but bloom boosters late in flower tend to promote foxtailing in the final stages. Foxtails are as good smoke as normal part of the flower, just doesnt look as nice in the final product. Cheers

will it leave a chemical taste if I use it during flush?

hey there papasmurf, Canna boost is an additive called humic acid you can use it until the very end if you would like. Hope this helps ! 🚀