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.
Plant list: Summer perennials
