Take a look here, Marsha. See if this helps.

Ann

Here is a link that might be useful: penstemon

Hi Ann,
I am still confused, are there seeds inside the pod? When I open the pod I don't see anything that look like seeds. Are the seeds tiny?
Thanks for your help!
marsha

Marsha,

The seed site says "Seedpod is woody and pointed, in a cluster. Seeds are brown, irregular-shaped chips. Several seeds in a pod."

Sorry I can't be more help. I know the picture I referred to above makes them look like large moon rocks LOL But I'm sure they're quite tiny.

Ann

"Sour Grapes" is a hybrid, and chances are that any seed collected will not resemble the parent plant. Then again, you might get something even more interesting! I had purchased "Sour Grapes" two years ago, at a local nursery, on the perennial table. Unfortunately, it's a perennial in zones 7 and warmer. Mine never returned, nor did it set seed. I haven't had any problems harvesting seeds from my other penstemons ("Huskers Red", "Rondo", P. strictus).