Multiply - Gallon (SPECIAL ORDER) SPECIAL ORDER - Multiply and Stack are designed to be used with all nutrient regiments and feeding programs. Using Multiply then Stack as directed united nature and technology at your fingertips. Add Multiply every 7 to 10 days from week 1 to turnover. Foliar Spray Stack at turnover. Re-apply every 7 days for 6 weeks.... — Ships from DL: Livermore, California USA....more info.