Best Plant and Root Enzymes - Humboldts Secret Plant Enzymes - 7,000 Active Units of Enzyme per Milliliter. (2 Ounce) PLANT ENZYMES WILL AID IN THE breakdown of cellulose and dead root material. VERY CONCENTRATED. USE at rate of 1 ml/gallon for the entire growing cycle. Will make about 60 gallons. PLANT ENZYMES WILL HELP CLEAN roots, providing better contact between the root and the nutrient solution for better nutrient uptake. WORKS VERY WELL WITH Humboldts Secret Golden Tree & Humboldts Secret Flower Stacker. COMPATIBLE WITH ALL MEDIUMS. Plant Enzymes contains over 7<span class="a-text-bold">,000 active units/ml of the enzyme Cellulase.</span> You can use Plant Enzymes with every nutrient feeding, or <span class="a-text-bold">between 1-3 times a week</span>. More or less depending on how well your plants are responding. Plant Enymes should be used in <span class="a-text-bold">conjunction with a complete nutrient regimen</span>. Plant Enzymes are extremely helpful when using heavy duty nutrients. YES, Plant Enzymes is <span class="a-text-bold">particularly helpful</span> if you are growing in DWC, CoCo, and Aeroponics.