How much Tower Tonic do I need?
Most Tower Garden users do not need more than a 2-gallon supply per year.
The amount of nutrient solution (water + Tower Tonic) your Tower Garden will consume will vary, depending on the plants you are growing and the conditions you are growing them in. For example, the larger your plants get, the more water and nutrients they need. During the hot summer months, you can actually add fewer nutrients.