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Joined: May 2009
I use nepeta "Six Hills Giant" as a weaver plant in my garden. For many years I fertilized them and watered them along with the roses and the rest of the perennials. And they bloomed and grew like crazy and then, as you wrote, they flopped. So now I don't fertilize or water them and they stay shorter and more manageable. They bloom just as beautifully even though we are in a 2 week heat wave. They also seed everywhere.
I use this principle now with the poppies, lady's mantle and many other of the strong growing perennials I have and it seems to work! Which makes for less labor and that is important since I'm not getting any younger.