This perennial grows vigorously in my zone 7b North Georgia mountains garden. The first year, it grew to only about 2 foot tall, but the second year it grew to 4 feet, and this year it is over 5 feet tall with lots of branching. I have also seen this plant growing and blooming vigorously in the Alaska Botanical Garden in Anchorage. It is a pollinator magnet. By cutting back the initial flush of blooms after they are done, I get a second flush of blooms later in the summer.

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