Photo from the web You can keep your yard full of bright color from June through October with low-maintenance flowers. Pick tough plants like purple coneflower, black-eyed Susan, and marigolds that handle heat well. Give them the right sun and water when you first plant them, and they will bloom all season. Purple Coneflower for Nonstop Color Purple coneflowers are tough plants that bloom from June right up until the first frost in autumn. They grow best in full sun, which means they need at least six hours of direct sunlight every day. These flowers reach up to three feet tall, so plant them near the back of your flower beds. Water new coneflowers twice a week for the first month after planting. Give each plant about one gallon of water each time. Once the roots are set, follow these steps to keep them blooming: Water once every ten days if it does not rain. Cut off dead flower heads every Friday to trigger new buds. Leave the final fall blooms on the plant so birds can eat t...