Penstemon 'Sour Grapes' (penstemon 'Sour Grapes') is a member of the Plantaginaceae family. This perennial exhibits a clump forming growth habit and is characterized by its semi evergreen foliage. It has a hardiness rating of hardy – average winter (-10 to -5ºc), and is hardy through most of the uk apart from inland valleys, at altitude and central / northerly locations. may suffer foliage damage and stem dieback in harsh winters in cold gardens. plants in pots are more vulnerable. .
When fully mature, Penstemon 'Sour Grapes' can reach an ultimate height of 0.5–1 metres and a spread of 0.1–0.5 metres. For optimal growth, it prefers west–facing, south–facing, east–facing aspect and exposed, sheltered exposure. It thrives best in chalk, loam, sand soil types and should be placed in a full sun, partial shade position.
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Foliage
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Fruit
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Stem
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