How to prune philadelphus 'snowbelle'

Directly after flowering, early summer. Shorten flowered shoots to strong new laterals. Cut one to two of the thickest, oldest canes to the ground annually to open the plant and stimulate fresh flowering stems from the base.

Annually after flowering. Snowbelle mock orange blooms on old wood in early summer. Prune right after the double white flowers fade, shortening flowered shoots to young, vigorous lateral growth. Remove one or two of the oldest stems at the base each year. Avoid any significant pruning in late summer, autumn, or winter — flower buds for the following year are already forming.

Shorten flowered shoots to strong new laterals. Cut one to two of the thickest, oldest canes to the ground annually to open the plant and stimulate fresh flowering stems from the base.