It's great for azaleas and other acid loving plants. Superphosphate will help the plants grow strong branches and help flowering. By adding slow release nutrients now, I won't have to fertilize this summer at all. I prefer using organic fertilizers instead of chemicals. Plan your garden on paper first.
Graph paper works great.
Measure your garden, then use one block of the graph paper to represent one inch. Plan your placement of plants according to mature size. I will encircle them with white alyssum. Any leftover spaces will be filled in with Cosmos and Zinnias. I know that Butterfly Bushes will grow to about 5 feet wide here.