If your perennial garden starts to fizzle as soon as hot weather arrives, then you need a plan to keep your beds blooming. Try interplanting your perennials with annuals that love hot weather. You can experiment each season until you find combinations that suit you, your garden, and your climate.
Since all of these plants are annuals or frost-sensitive perennials, no zone information is given. Some of these plants perform better in certain conditions, however, so check under "Can't Tolerate" for specific dislikes. All need full sun to flower well. Keep in mind that some of these plants can be aggressive self-sowers or may be listed as invasive in warmer regions. Check with your local Cooperative Extension office or the USDA Web site http://plants.usda.gov/ for a list of plants that are invasive in your area.
18 in. to 6 ft., varies with species
Red, orange, gold, green, purple
Notes: Resents transplanting. Direct-seed.
Can't Tolerate: Wet soil; shade