Penstemon ( Knight’s Purple Penstemon )
The genus Penstemon is made up of 250 mintage of deciduous , semi - evergreen , and evergreen perennial and subshrub , and legion cultivars which lean to be semi - evergreen plant . Leaves are narrow-minded , up to 3 inch retentive , or large and ovate , to 5 inch long . raceme or panicles of foxglove - like flowers are farm from early summertime to mid fall ....