The PK Bloom Booster is used during the bloom phase of your plants.
During the bloom phase your green-leaf plant needs a lot of phosphates and potassium.
The plant "feels" the phosphates present in the substrate and uses these to produce the necessary amount of bloom hormones.

Use PK Bloom Booster up to one week before harvesting.
The FERRO PK Bloom Booster Enriched is a PK fertilizer enriched with plant hormones, amino acids and fifty different trace elements.