Centaurea Macrocephala (Knapweed) (3 litres)
A very long name for our second knapweed. A magnificnet plant, this time from the US. Growing 3 feet this plant produces large Scottish thistle like flowers in yellow, up to 4 inches across. The leaves are attractive and they look wonderful in floral arrangements. I have seen 2 others specimens of this perennial in 25 years – it is listed by the RHS as garden worthy but doesn’t seem to be in production.