Penstemon 'Sour Grapes' sits within the genus Penstemon and the family Plantaginaceae; its flowers display the typical tubular, two-lipped corolla and the conspicuous staminode that helps identify beardtongues. In the UK it flowers from June to September, producing repeated displays of these diagnostic blooms over the summer months. Growers treat Penstemon cultivars to promote clean-looking plants and prolonged bloom. Provide a position where water does not sit around the roots, and remove spent flower spikes to keep the plant tidy and to encourage further flowering. A short prune of the flowering stems after the main season will refresh growth and prepare the plant for the following year. Use individual plants where their upright flowering stems can be appreciated — the floral structure is easiest to inspect close to head height. The visible staminode on each corolla makes Penstemon 'Sour Grapes' useful for teaching or demonstrating the distinctive morphology of beardtongues to visitors or students interested in flower form. Flowering runs June to September, during which the staminode and the two-lipped flowers are most apparent.

Penstemon 'Sour Grapes' is a cultivar of Penstemon (family Plantaginaceae) distinguished by the genus's two-lipped, tubular flowers and the prominent sterile stamen or staminode. Each bloom shows the characteristic bearded palate that gives beardtongues their common name. Flowering in the UK runs from June to September. The flowering stems carry multiple blooms, making the staminode readily visible on each flower.

Penstemon 'Sour Grapes' is a Penstemon (Plantaginaceae) cultivar with two-lipped tubular flowers and a prominent staminode, flowering June to September.

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