Centaurea macrocephala (Giant knapweed):
Huge, bright yellow almost fluffy flowers in mid-summer follow attractive papery buds. Attractive to bees.To 1.5m. Hardy.
[Collect Only]
Cephalaria gigantea (Giant scabious):
Very tall wavy stems topped with large lemon yellow scabious-like flowers. Easy to grow. May need staking or support. Hardy. Up to 2m.
Rudbeckia laciniata:
Very tall form adding impact to borders. Vibrant yellow flowers with a darker central cone. Great late-flowering perennial, looks good with grasses. To 2.5m.
[Collect Only]