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Celosia, sometimes called cockscomb, is a great annual flower that holds its color well even in the dog days of summer. Plants grow from 10 inches to 2 feet tall and feature either green or bronze foliage. Flowers come in a range of colors and two primary shapes: crested blooms like a rooster's comb and feathery spikes like those shown in the photo, with petunias and dusty miller.
Photo: Luke Miller/Oldsmobile Trees
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Petunias are a heat-loving annual that go full blast into fall. Flowering sometimes slows down in late summer but you can coax more show from plants by not only removing the faded trumpet-shaped flowers but pinching off the seedpods as well. This, along with plenty of water and sunshine, will keep petunias going until a hard freeze. Flowers come in almost every color, and some bring their own contrast with bicolored blooms. These purple petunias are shown with lavender and Diamond Frost euphorbia.