Question: What kind of fertilizer is best for a planting of assorted perennials?
Answer: That’s difficult, because something will always be blooming at the same time that other plants are growing vegetatively. A soil test will always be your best way of knowing exactly what you should use. In most cases, a quality all-nitrogen fertilizer, similar to what you would put on your turfgrass, will do very well. Apply one to two pounds per 100 square feet in early spring, late spring and early fall. Brush over the plants after you fertilize, to get rid of any granules that may have lodged in their leaf axils, and water thoroughly as well.