15 Fast-Growing Flowers for a Cutting Garden

This perennial (grown as an annual in colder climes) features quarter-inch purple flowers atop stiff, coarse stems. It can grow to about 6 feet and into clumps about 3 feet wide. It'll bloom all summer long and is fairly drought-tolerant. USDA Zones 7-11

TOH Tip: If you want to encourage branching, pinch the first shoots in the spring.