How to Prune canna 'Delaware'?
Leave to die back in autumn, deadhead flowers to prolong flowering

canna 'Delaware' · Canna 'Delaware'
As a patio plant grow in pots of loamless compost in a sheltered site in full sun. Plants can also be planted into a sunny border. Water freely and apply a high potassium feed every 2-3 weeks in the growing season. Lift the rhizomes in autumn when frost blackens the foliage. Store over winter in barely moist compost in frost-free conditions. See canna cultivation for further information
Leave to die back in autumn, deadhead flowers to prolong flowering