These estimates for how long Penstemon alpinus takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Days to Germination How long does it take Penstemon alpinus to germinate?
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Days to Transplant How long until I can plant out Penstemon alpinus?
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Days to Maturity How long until Penstemon alpinus is ready for harvest / bloom?
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Total Growing Days How long does it take to grow Penstemon alpinus?