We planted 3 mountain fire plants and a Green mountain boxwood. We are need to know How and what we should use to fertilize them.
The best food for them would be Espoma Holly-tone, a granular, organic food. You probably use a couple of cups per plant. You can pound several holes in the soil in a ring around the plants about as far from the trunk as the outermost branch tips and pour the food into these holes. Here’s a blog post that covers the “how to” of spring feeding our landscape plants.