How to Prune large yellow foxglove?
Cut back main flower spike as it fades to encourage the growth of flowering side shoots

large yellow foxglove · Digitalis grandiflora
Also known as: cream-coloured foxglove; great yellow foxglove; large-flowered foxglove; yellow foxglove
Will grow in almost any soil or situation except very wet or very dry; ideal site is a humus-rich soil in partial shade.
Cut back main flower spike as it fades to encourage the growth of flowering side shoots