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Rhodanthe chlorocephala_ subsp. _rosea
Enjoy summer's flowers into fall by growing this brightly colored charmer that dries right on the plant. Use it in dried flower arrangements, wreaths, and even homemade potpourri. This easy-to-grow, sun-loving annual heralds from Australia and is a great pick for hot, dry sites. Plant it outdoors after all danger of frost has passed in spring.
how to grow Strawflower
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Ageratum is such a little workhorse that nearly every garden should have some. This annual is an easy-to-grow, old-fashioned favorite that produces a steady show of colorful powder-pufflike flowers from late spring through frost. It's also rarely bothered by pests, so you count on it to look good. Plus, it provides some of the truest blues you can find in flowers -- a rare thing.Plant in spring after all danger of frost has passed. Plant in groups of a dozen or more for best show. Deadhead and fertilize regularly for best blooms.
If you love morning glories, try this low-growing cousin, which has even more gorgeous sky blue flowers. Like the morning glory that grows upward, this more earthbound beauty produces striking blue flowers all season long. And like its cousin, the flowers tend to close in the afternoon hours. In Zones 8-11, in the warmest part of the country, this tropical is a perennial; farther north, it's grown as an annual. Its spreading habit is perfect for spilling over baskets, window boxes, and other containers.Plant established plants outdoors after all danger of frost has passed. Evolvulus likes rich, well-drained soil and needs just average water. It's somewhat drought-tolerant, so don't overwater.
With its intricate flowers and fine-texture foliage, nigella stands out in the garden. This delightful little annual blooms throughout the summer, and the seedpods are often used in dried-flower crafts. Nigella does best in full sun and well-drained soil. It often reseeds.