How to Prune foxglove 'Pam's Split'?
No pruning required, but deadheading, cutting down dead flowering stems, will encourage growth the following year

foxglove 'Pam's Split' · Digitalis purpurea 'Pam's Split'
Grow in moist but well-drained humus-rich soil in light dappled shade, for example in a mixed bed or an open woodland garden, and add organic mulch; native foxgloves are usually found in the wild on acidic soils, but they can also grow on neutral soils and tolerate slightly alkaline soils
No pruning required, but deadheading, cutting down dead flowering stems, will encourage growth the following year