How to Prune lords-and-ladies?
No pruning required

lords-and-ladies · Arum maculatum
Also known as: Aaron; Adam and Eve; adder's meat; adder's root; arrowroot; bloody man's finger; bobbin' Joan; bobbing Jane; bobbins; boys and girls; brown dragons; bulls and cows; calf's foot; cobbler's thumb; cocky baby; cuckoo pint; devil's ladies and gentlemen; devil's men and women; English passion flower; friar's cowl; Gethsemane; jack-in-a-box; jack-in-the-pulpit; Kitty-come-down-the-lane; lamb in a pulpit; lily grass; mandrake; naked ladies; nightingales; parson and clerk; parson in the pulpit; Portland arrowroot; Portland sago plant; Portland starchroot; priest's pintle; rampe; snake's victuals; starch flower; starch plant; wake-robin
Grow in moist but well-drained humus-rich soil and plant 10 to 15cm deep in light shade. Self-seeding may be a problem
No pruning required