From a fellow grower: I’m growing three autos using nothing but BuildASoil 3.0, BuildAFlower top-dressing and remineralized RO water. They’re in 3 gal. Grassroots pots. With that smallish pot size, would you recommend top-dressing twice, like at 3 weeks and 7 weeks?
I would top every 2 weeks. It can take 1 to weeks for those amendments to become avail to your plant. In a 3 gal pot, need to stay ahead of restocking the fridge.