You may already know that Penstemon can be very slow. They do need cold moist stratification, and they are hardy, so they're a good chouce for "winter WS".
Tom Clothier has a database of how many weeks coild strat each P. species needs.
http://tomclothier.hort.net/pa...
I see mostly "8 weeks" there, and some "12 weeks". You might not have 8-12 weeks left of weather below 40 F. Maybe keep it in shade once weather starts to warm up.
But you can try, just save some seeds (and the sown jug) for next year. Or, if nothing has happened for months and your nights are starting to stay above 40, bring the jug into your fridge for a few more weeks.
They also need light to germinate, so sow them on the surface and don;t bury them by watering or letting them be rianed on.
My first year WS, Penstemon were the only thigns that sprouted at all, but they waited until May or June to come upo, and then did not grow even one inch the rest of that summer. They require a lot of patience!
