18" tall x 12-15" wide (seed propagated). The richly colored, deep cobalt-blue and lavender flowers of Penstemon mensarum will leave you in awe. When planted with other late spring bloomers like lemon- yellow Achillea Moonshine and red Salvia greggii Furman's Red, you will have a traffic- stopping color combination. Grand Mesa Beardtongue grows to form a sturdy semi-woody plant with deep glossy green foliage. A long-lived Penstemon when grown in a lean, well- drained soil where it gets a lot of sun. Clip off the bloomed-out flower spikes right at their base, then thin out and shape the stems at the base of the plant for a profusion of flowers the next spring.