Tips for Planting AnnualsFor color all summer long, choose the right annual plants for the location. Buy plants that don't have many blossoms on them yet, and when you plant them, pull off any blossoms they already have. That will let the plant spend its energy growing stronger roots and producing more flowers. (Yes, it's hard to make yourself pull off those blossoms, but you'll get many more flowers in the long run.)
When you buy the annuals, buy some bone meal and some blood meal. Put a handful of each into the holes before you plant the flowers. They act as slow-release fertilizers.Check the tags to make sure the plant is right for the location. Some, such as petunias and the marigolds, need full sun; others, including begonias and impatiens do better with some shade. And some need to be in almost full shade; examples include caladiums, hosta and wax begonias.