How to Prune moss phlox 'Snowflake'?
No pruning required

moss phlox 'Snowflake' · Phlox subulata 'Snowflake'
Will perform best in well-drained fertile soil in a sunny or dappled shade positon, prefering full sun and avoiding waterlogging. Can be trimmed back in autumn to rejuvenate and shape.
No pruning required