How to Prune Spanish broom?
Prune lightly as needed to remove unwanted shoots and keep the shrub in shape. Prune in mid- to late spring.

Spanish broom · Spartium junceum
Also known as: rush broom; weaver's broom
Thrives on poor, well-drained soils in exposed, sunny sites and can become leggy in sheltered positions. Good for coastal situations and chalk but is not fully hardy in the UK
Prune lightly as needed to remove unwanted shoots and keep the shrub in shape. Prune in mid- to late spring.