House & Garden Top Booster 5 Litres House & Garden Top Booster is an excellent flowering booster for use in addition to the other products in the House & Garden range. Top Booster contains easily absorbable forms of phosphorous and potassium to considerably increase the number of bud-sites and the final weight and quality of your harvest. How H&G Top Booster Works During the flowering cycle, plants require more Phosphorous and Potassium (PK) to prevent them from becoming defficient. House & Garden Top Booster contains generous quantities of these 2 nutrients in a form which is easily absorbable by the plant. Used in addition to your usual base nutrient, Top Shooter will ensure that your plants do not run short of these essential nutrients. Top Booster also contains iron for healthier leaves. The result is an increase in the number of flowers and budding sites. Also the weight and quality of your harvests is greatly improved.