How to Prune broom 'Boskoop Ruby'?
Shorten flowered shoots to vigorous sideshoots; remove about a third of stems at ground level annually. Prune immediately after flowering.

broom 'Boskoop Ruby' · Cytisus × boskoopii 'Boskoop Ruby'
Best grown in well-drained poor acid soils in full sun. Tolerant of lime but may become chlorotic on shallow chalk soils. Plant when small, brooms resent transplanting
Shorten flowered shoots to vigorous sideshoots; remove about a third of stems at ground level annually. Prune immediately after flowering.