A great “booster” that I spray weekly from veg through week four of flower is a product from Kelp4less call Extreme Blend.
It’s a mix of Humic, Fulvic, and Amino Acids, along with Norwegian Sea Kelp…can see the difference overnight!
You can use this along with any P/K(Phosphorus/Potassium) booster…I personally use a P/K booster 1st week of flower…helps with stretch and close nodes…so many brands to chose from…Humboldt or Nectar From the Gods both make decent ones. Or you can DIY…
Also don’t forget to use a bud hardener(Potassium) before the flush to get maximum yield. Humboldt Nutrients “Deuce Deuce” (0-0-22) works amazing!
Happy Growing
Brian(Alaskagrown)