Answer: You can replace it or you can cut it back almost to ground level every spring. This will remove the old foliage and stems and encourge lots of new flowering stems to grow. Try cutting it way back this spring and watch how it behaves. I think you'll see lots of flowers and very little powdery mildew this year. If you don't like the way it grows after being cut back, go ahead and replace it. I think it deserves at least one more chance to show you how beautiful it can be. Best wishes with your garden!
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