delphinium [Princess Caroline]

Grow in a fertile, well-drained soil in full sun; shelter from strong winds and stake well. Apply a balanced liquid every couple of weeks in the growing season. For the best flower spikes thin shoots when 7cm high to leave a minimum of 2-3 shoots on young

Deadhead spent flower spikes. After flowering, cut down all growth to ground level. If fed and watered well, a second flush of flowers will be produced in autumn

Propagate by taking pencil thick basal cuttings in early spring or propagate by seed in spring or autumn (cultivars will not come true)

May be attacked by leaf miners and caterpillars

May be subject to powdery mildews if too dry, delphinium black blotch, crown rot and a virus