Zebra Hollyhocks are perennials that bloom all summer long. They are easy to grow, self seed, are drought tolerant, and attract butterflies. They grow in sun to part shade and get 2-4' tall. Great for perennial beds, cottage gardens, borders, and rock gardens. Zones 4-8
If you have the space, always plant a few extra flowers that you can cut for indoor bouquets. Two of your best options are coneflower and black-eyed Susan. These rugged perennials produce armloads of flowers on tall, easy-to-cut stems from late summer to fall.