Centaurea nigra - 2026

Centaurea nigra, commonly known as common knapweed or black knapweed, is a hardy, clump-forming perennial valued for its bright, thistle-like purple flowers that bloom from late spring to late summer. The attractive, daisy-like blooms rise above dark green, lance-shaped foliage, providing vertical interest and long-lasting colour in wildflower meadows, borders, and naturalistic plantings. Its nectar-rich flowers are highly attractive to bees, butterflies, and other pollinators, making it an excellent choice for wildlife-friendly gardens and enhancing biodiversity.

Thriving in full sun with well-drained soil, Centaurea nigra is robust, low-maintenance, and adaptable to a range of garden conditions, including poorer soils. Cutting back after flowering can help to prolong bloom and maintain a tidy appearance. Hardy and resilient, it self-seeds readily, making it ideal for naturalistic or meadow-style plantings. Combining ornamental appeal, pollinator value, and ecological benefits, it is a versatile perennial for sustainable and wildlife-conscious gardens.