How to Prune bog rosemary?
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.

bog rosemary · Andromeda polifolia
Also known as: marsh andromeda; marsh holy rose; marsh rosemary; moorwort; North American wild rosemary
Grow in moist, acid, humus-rich soil in sun, part or full shade
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.