Observed: July 3, 2011 @ 2:00 PM
Posted on: July 4, 2011 @ 5:50 AM (diff: 1 days)
Mountain bluet (Centaurea montana) also known as Perennial Cornflower or Perennial Bachelor's Buttons is escaping gardens and infesting landscapes. It is an invasive weed. Mountain bluet is a taprooted perennial herb from Europe. It prefers full sun and dry to medium-wet conditions. It grows up to 30 to 80 cm tall and has simple, lance-shaped leaves that have a lightly woolly underside. The whole plant is lightly hairy. Flowerheads are similar to knapweeds. The disk flowers ("petals") are usually blue but can be white. Flowers bloom from late spring to early summer.