Giant Knapweed (Centaurea Macrocephala) is a perennial herb in the Asteraceae family with moderate care difficulty. It requires moderate watering and full sun or partial shade light in USDA hardiness zones 4-9. This plant is safe for cats and dogs.

Centaurea macrocephala is a large perennial plant known for its bright yellow, thistle-like flowers that are 3-4 inches across, enclosed in glossy, light brown bracts on strong, stiff stems.