Ask a Question forum: germination requirements of penstemon heterophyllus Blue Spring

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Name: verdant muse
NW CT (Zone 5b)
verdantmuse
Mar 10, 2014 12:16 PM CST
Hello, I have some penstemon heterophyllus Blue Spring seed and wondered if anyone had experience germinating the seed and could share their methods for success.

Thanks!

verdantmuse
Name: Anne
Summerville, SC (Zone 8a)
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Xeramtheum
Mar 10, 2014 2:30 PM CST
I'm growing them from seed for the first time myself. They require light to germinate as well as a cold period. Considering where you are, I'd sow them on top of some potting mix - don't cover, in a container with a clear lid and stick it outside in a bright but not direct sun place where it won't get covered with snow. I'm putting mine in the fridge for about 6 weeks.
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Name: Michele Roth
N.E. Indiana - Zone 5b
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chelle
Mar 10, 2014 3:02 PM CST
I agree

I winter sowed mine last year. I can't wait to see those first blooms! Lovey dubby
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Name: Rick R.
near Minneapolis, MN zone 4a
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Leftwood
Mar 10, 2014 5:10 PM CST
Dr. Deno's trials show this species to be variable. In testing he found about 66% of seeds germinate in dark in the second week and 66% germinate in light in one to three weeks, both at 70F. In another trial he found 95% germination at 40F in 8-10 weeks.

In my own experience, I've had a very small percentage germinate in 2 weeks at 70F, and a large percentage germinate at around 40F after winter sowing.
Name: verdant muse
NW CT (Zone 5b)
verdantmuse
Mar 10, 2014 5:41 PM CST
Thanks so much for the information on germination requirements for the penstemon heterophyllus. Since I had already sprinkled some seed on containers with potting mix and kept the pots at 68 degrees, I popped the conatiners into the fridge and will see what happens. For a control, I'll try some each way suggested: always learning!

verdant muse

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