Follow label directions, spacing anywhere from 8 inches to two feet apart. Mulch around petunias. This keeps their sticky leaves and flowers clean. Keep the soil at least slightly moist. When watering petunias, be careful not to get their flowers wet or they ll close.
Petunias do best when fertilized every four weeks or so with a water-soluble fertilizer.
Pull out and discard after the first frost. Inc. How things get done. Use of this Web site constitutes acceptance of the eHow Terms of Use and Privacy .