check out this plant- Yours looks like it to me - Rehmannia angulata aka Chinese Foxglove . Not a penstemmon but has a similar shaped bloom. Here...
Drying the cuttings sounds a little odd perhaps , I realize, but without drying a little first , the cuttings ,for me , have turned to mush in...
I have propogated arundo donax by taking a cutting and letting it dry for a bit then submerge it in water. or cut it up into small segments...
Yes, It is Kalanchoe daigremontiana or More commonly known as Mother of Thousands. Succulent . It will also put out roots from its stem so you can...