Blossoms last about three days in the garden or two days in a vase. If you plant early-, mid- and late-season varieties, you should have blooms for almost four weeks.
Try yellow coreopsis varieties as companions for Japanese irises, John says, because they bloom at the same time in a pleasing color combination.
Pictured, clockwise from top left: 'Silverband', 'Rosy Sunrise', 'Crown Imperial', 'Eileen's Dream', 'Tropical Storm'
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