HydroTops Head StartbiOpOnic Head Start has been developed to compliment our biOpOnic and Next Generation nutrient ranges and is designed to give your plants a head start in life every time. Using head start, you immediately see a difference in growth and vigour in your plants. Plants grown on head start are prepared to go on and produce abundant foliage and profuse flowers later in the growing cycle. Available in 1 litre, 5 litres No plant growth regulators (PGRS) Head