Introduced to North America from Europe in the 1800s as an ornamental shrub, Scotch broom now serves as a sobering example of what happens when a plant finds a new continent entirely to its liking. It grows 4 to 8 feet tall with arching green stems that give it a broom-like silhouette, and in late spring those stems are covered in pea-like yellow flowers — genuinely showy, which explains the original enthusiasm. But a medium-sized plant can produce thousands of seeds per year, those seeds can remain viable in soil for up to 20 years, and the plant resists cutting, freezing, and even wildfire by resprouting from its roots.

On the West Coast it is declared invasive; in parts of Georgia and South Carolina it is listed as a noxious weed. Its nitrogen-fixing ability allows it to colonize dry, sandy, disturbed soils where native plants struggle to compete. The ecological concern extends beyond crowding: dense stands increase wildfire risk and reduce grazing habitat. If encountered in a garden, removal before flowering and seed set is the only reliable approach. Native alternatives that offer comparable spring color without the ecological baggage are a far better choice for any planting.