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	Plant list: Summer perennials Half-hardy perennials are best brought into a frost-free place, such as a greenhouse, for the winter. Alternatively, buy new plants each year.
	Penstemon Penstemon Perennial Half-hardy White, pink, red, mauve and purple Dark green 30cm to 90cm x 30cm to 90cm (1ft to 3ft x 1ft to 3ft) Penstemons are grown for their spikes of bell-shaped flowers and make a great splash of colour in the perennial border. They prefer a sunny spot and rich, well-drained soil. To prolong the flower show into autumn, deadhead regularly.
	Related plant lists: Spring-flowering bulbs Trees for spring blossom Spring-flowering shrubs Summer bedding plants Summer perennials Summer roses Autumn foliage Autumn berries and fruit Autumn seed-heads Winter evergreens Winter bark and stems Winter flowers