How to Prune intermediate moltkia?
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.

intermediate moltkia · Moltkia × intermedia
Grow in poor, well-drained, preferably alkaline soil in full sun. Protect from winter wet and shelter from cold, dry winds
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.