How to Propagate blue blossom?
Propagate by semi-hardwood cuttings in mid- to late summer

blue blossom · Ceanothus thyrsiflorus
Also known as: blue brush
Grow in fertile, well-drained soil in full sun with shelter from strong, cold winds. Lime tolerant but may become chlorotic on shallow chalk soils. See ceanothus cultivation
Propagate by semi-hardwood cuttings in mid- to late summer