Sidalcea (miniature hollyhock) zone 4

Have any gardeners successfully grown sidalcea in zone 4? Cut back and mulch heavily? any tips?
Thanks Karen
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One of my worst gardening mistakes was bringing these into the cultivated garden. They have woody roots that make them miserable to dig out, self-seed worse than rats and will "eat" an entire garden area in 2 years. Don't grow 'em -- even in pots -- unless you have a huge wild area that you simply want to fill in. Count on it, they will! I even had one of the more -- supposedly -- restrained cultivars, "Party Girl." Suzy O

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