The secret to making your flowering trees, shrubs, annuals and perennials produce more blooms is in the numbers.
All fertilizers have analysis numbers on the package.
These numbers represent the percentage of each chemical the product contains. Most lawn grasses are vigorous growers and therefore require significantly more nitrogen than the other plants in your yard. You would not want to use a fertilizer containing such a high percentage of nitrogen on landscape plants because it would be very easy to burn them. You must also keep in mind that many lawn fertilizers contain broadleaf weed killers, and most ornamental plants have broad leaves. The fertilizer doesn't know the difference, and will damage or kill ornamental trees and shrubs.