The 12- 12- 17+ 2Mg0 grain fertilizer is suitable for all types of plants (ornamental, fruit, etc.), giving them sturdiness and faster growth. Better seasons of application are spring and autumn.. Caution!!! It contains potassium sulfate and not potassium chloride that is dangerous to your plants. The main elements of the fertilizer are: Nitrogen, Phosphorus, Potassium.