How to Propagate Spanish broom?
Propagate by seed sown in containers in a cold frame in autumn or 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
Propagate by seed sown in containers in a cold frame in autumn or spring