Dutch Fest Hydro Grow A&B 1L Dutch fest nutrient offers a unique blend of macro and micro(trace) elements for stimulating short internodes and large floral blooms and is best used with perlite and rockwool systems. Dutch Fest Hydro Grow is a concentrated nutrient specially formulated for indoor hydroponic horticulture using High Intensity Discharge lighting during the growth cycle. The result of extensive research in the Netherlands, Dutch Fest Hydro Grow provides a unique balance of macro and micro elements essential for stimulating vigorous growth.