How to Prune lily of the valley?
No pruning required

lily of the valley · Convallaria majalis
Also known as: conval lily; lady's tears; liriconfancy; May bells; May lily; mayflower; mugget; Our Lady's tears; word lily
Grow in a fertile, humus-rich moist soil in full or partial shade. Top dress with leaf mould in autumn.
No pruning required