Taking stem cuttings is one of the go-to ways for propagating plants, and beardtongue, or penstemon, is very easy to reproduce with this approach. Before you get started, it’s easiest to get a container filled with your propagating mix ready ahead of time. Poke holes in the mix for the cutting or cuttings using a pencil or a chopstick. Start by cutting off a 3- to 5-inch stem just below a node (or swelling) or below a leaf or bud. Then remove the leaves from the lower half of the stem but keep at least three leaves on the top half. Dip the lower stem’s end in rooting hormone and shake off any excess. Add the stem to the propagating mix and firm it into place. Once you’ve added all the cuttings, water thoroughly and cover with plastic.