Blue knapweed (Centaurea montana)
Description
The plant shown appears to be a blue knapweed, a perennial commonly grown in borders for its striking cobalt‑blue flower heads. It belongs to the aster family (Asteraceae) and the genus Centaurea. The inflorescences are distinctive: rounded to globose heads densely packed with slender florets that give the blooms a wispy, almost thistle‑like appearance. Each flower head is surrounded by bracts that can feel slightly spiny, which adds architectural detail to the plant even after flowering. The overall clump is formed by sturdy, green stems rising from a tuft of leaves at the base. The leaves are lanceolate to elliptical, a smooth, green to gray‑green color, and they provide a neat, evergreen‑leaning backdrop to the bright blue blooms. Plants of this type typically reach a height of about 60–90 cm (2–3 feet) and spread 40–60 cm (1.5–2 feet), forming a dense, cottage‑garden clump that does well in mixed borders and sunny beds. While individual forms can vary, the image’s purple‑blue heads and the general growth habit strongly resemble Centaurea montana or a closely related blue knapweed cultivar, which is a popular choice for long‑lasting summer color and pollinator appeal.
Identification Time
May 13th, 2026
Notice
The function of Plantypia is using AI, so it may be inaccurate. Please use it for fun and reference only.