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 semi45evergreen foliage in spite of its name penstemon 39sour grapes39 is therefore sure to bring happiness and harmony to any sunny or partially shady border or patio container height 60cm 402