Use an odd number of plants when planting annuals, perennials, trees, and shrubs.
Use a thriller, filler, and a spiller in your container garden. Choose a tall focal plant for the center (thriller), medium-height plants around the focal plant (filler), and trailing plants around the edge (spiller). Feel free to mix annuals and perennials.
Plan for a succession of color throughout the season. Check the bloom times on perennials and be sure to include a mix of spring, summer, and fall bloomers. Add annuals for ongoing color. Tuck containers into your garden bed or border for an extra pop of color in the garden.

Look for garden tools with brightly colored handles so they are easy to find when you put the down in the garden.
Mulch your garden to conserve water and deter weeds. If occasional weeds appear (and they will), they’ll be much easier to pull.