Monster Grow™ Pro plant growth promoter Grotek Monster Grow™ Pro is a soluble, yet highly powerful growth enhancer that’s added to the existing feeding schedule once per week during mid to late veg and preflowering stages. It can be used in all styles of growing (soil, Coco or hydro) when high levels of Nitrogen (N) are needed the most. Adding Grotek Monster Grow Pro to your nutrient solution will encourage plants to display healthy growth, with leaves showing a lush green colour. Improved development of the root zone will also be apparent with plants becoming strong in structure as they prepare themselves for flowering.