How to prune cardoon

Autumn before first frost for blanching harvest; late autumn for general cutback; deadhead in summer before seeds set. Tie stems together and wrap or earth them up for 3–4 weeks in autumn to blanch. Deadhead flower stems with loppers before seed ripens. In late autumn, cut top growth to 20–30 cm, mulch heavily over the crown in frost-prone areas.

Annually for harvest preparation and cutback; deadheading as needed in summer. Cardoon needs pruning for harvesting and to manage its imposing size. Cut stems for blanching (earthing up or wrapping) in autumn before the first hard frost. Remove spent flower heads before seed sets to prevent aggressive self-seeding — cardoon can become invasive. Cut back dead top growth in late autumn; in cold climates, protect the crown with mulch.

Tie stems together and wrap or earth them up for 3–4 weeks in autumn to blanch. Deadhead flower stems with loppers before seed ripens. In late autumn, cut top growth to 20–30 cm, mulch heavily over the crown in frost-prone areas.