Some penstemons might grow above-ground root nodes on their own. I've noticed
this on the Dasantheras and P. subalpinus in my garden. This seems to happen
following long periods of cool, damp weather. Here in the northern
Willamette Valley, that's generally not a problem (unless I'm trying to grow
some of the dryland species of Penstemon, Eriogonum, etc. [Most of y'all are
also rock gardeners, so y'all know the drill...]). I've also noticed this with
Sedum--S. oreganum will be darned near dripping with roots if heavily
irrigated, particularly during summer.
So you might try air-layering to make the plant form roots before removing the
cutting from the rest of it.
-Nathan Miller
Newberg, OR
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