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Another great source of blue flowers, mountain bluet and perennial bachelor's button have the easy, casual growth habit of the wildflowers they are. This plant group also includes ornamental knapweeds, which have beautiful yellow blooms.
All three types are prolific nectar producers that attract butterflies. They self-seed readily, giving you lots more plants through the years. After blooming, like a lot of wildflowers, the plants get somewhat weedy looking and benefit from a cutting back by a third to a half to keep them tidy. If they like their growing conditions, they will spread into larger clumps that need dividing every couple of years.
Part Sun, Sun
Under 6 inches to 8 feet
1-3 feet wide