Plantex 15-30-15 water soluble fertilizer is ideal for hydrangeas since the high phosphorus content ties up excess aluminum in the soil which causes a strong pink colouration in the blooms. Acid-loving plants such as african violets respond well to this formulation due to its high potential acidity. Use during the early stages of crop growth, when many greenhouse crops require extra phosphorus, particularly tomatoes and cucumbers grown in soil. Plantex 15-30-15 can be used to remedy phosphorus deficient soils.

Plantex 15-15-30 water soluble fertilizer supplies twice as much potassium as nitrogen, while still maintaining the optimal levels of the other plant nutrients. Over 58% of the nitrogen is in the nitrate form. It has a very low potential acidity, exhibiting minimal acidifying tendencies in the soil. It is recommended when soil levels or tissue samples show low potassium levels or when plants are setting bud, as well as during maturation and blooming.