I left the full frame of this Centaurea montana so that you can see how it persists in spite of grass, roses, nettles and various other weeds. We planted Centaurea montana more than 20 years ago – and then decided that spot, a small bank, was not a good place. We mowed everything down. The Centaurea didn’t notice and it continues to come up every year. It is not invasive, just persistent.
Centaurea montana is also called perennial cornflower or mountain bluet. It obviously doesn’t need any special care. It prefers full sun but can tolerate light shade which it gets in my garden. It grows at the edge of shade thrown by our ancient apple tree. It spreads by stolons so can move around the garden. Our mowing has limited it to this spot next to The Rose Walk. Most of the weeds will be removed by the day of the Annual Rose Viewing.