There will be no sour grapes if you choose to grow this hardy perennial. When the plant flowers in June, there will be plenty of pink and blue blooms to satisfy every gardener throughout the summer and well into the autumn. These flowers grow on upright spikes, which protrude from durable, semi-evergreen foliage. In spite of its name, Penstemon 'Sour Grapes' is therefore sure to bring happiness and harmony to any sunny or partially shady border or patio container. Height: 60cm (2'0); Spread: 45cm (1'6).