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Penstemon 'Iron Maiden' Grew 3 Inches then Stopped

Hi,

I was able to germinate some Iron Maiden penstemons from seed this spring, but after I planted them outside, they have not grown at all; they have just been sitting there for almost 3 months. What do I need to do to get them growing? They are getting 2/3 day sun in an eastern exposure).

Thanks!

Lois (aka Perplexed by Penstemon)

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