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Are Ruby penstemons hardy in Zone 6?

19 years ago

Hi! I'm growing flowers for the first time (I have more experience with veggies) and bought some beautiful "Ruby" penstemon plants. The label says to take cuttings for overwintering in cold climates, and the website that matches the label says they're hardy in 8-9. However, I found another website that says they're OK much further north.

Does anyone know from experience how they'll do, and if cutting them back or mulching would help?

I've saved some seeds--can I grow a fully mature plant in one season?

Thanks very much!

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