When you select your flowering plants (whether annuals, perennials, shrubs or trees) pick varieties that will grow well in your environment. If you have lots of sun throughout the day, choose flowering plants that thrive in full sun, because if you buy plants that do best in partial shade, nothing you do will help your plants.
Correct Your Soil
Test the pH of your soil with a pH tester or take a sample to your local cooperative extension office for testing. Neutral pH is 7, and most flowering plants will grow in soil that ranges between 5.5 to 7, but the ideal is 6.3 pH to have your flowers at their best.
Supplement your soil with either limestone or sulphur to correct the pH. If your soil test indicated a number lower than 6 or 7 pH, it means your soil is acidic. Higher than 7 readings are for alkaline soils. To lower the acid and raise the pH in your soil, work in, to a depth of 6 to 8 inches, limestone in the amount of 10 pounds for 100 square feet.
Once in awhile, soil will test high in pH value. If this is the case with your soil, confer with your local agricultural cooperative extension office for the proper amount of sulphur to supplement your soil.
Fertilize your flowering plants every two to three weeks with water soluble fertilizer, or every six to eight weeks with time released fertilizer. The fertilizer you apply needs to either be an equally balanced blend, like 10-10-10, or, more ideally, a blend with a higher phosphorus amount than nitrogen or potassium, such as 5-10-5. Feeding a higher phosphorus blend to your flowers promotes and grows more and better flowers on your plants.
Cut the dead flower heads off your flowering plants to encourage your plant to produce more flower buds, instead of allowing your plant to put its energy into making seeds.