BAC Foliar Spray


Does any of you used it ? I get an 10ml sample but don’t know how and when to spray it onto plants. Description says

B.A.C. Organic Foliar Nutrition ensures the quick creation of chlorophyll (green colour) in the leaf. BAC Foliar Nutrition stimulates the micro-organisms living on and in the leaf (photosynthesis bacteria) that ensure the creation of chlorophyll.

The price of it is huge
33$ for 120ml