Alchemilla mollis (Lady's mantle):
Bright green soft leaves and a froth of acid yellow/green flowers in summer. Very easy for ground cover
Centaurea macrocephala (Giant knapweed):
Huge, bright yellow almost fluffy flowers in mid-summer follow attractive papery buds. Attractive to bees. Height to 1.5m. Hardy.
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 subtomentosa 'Little Henry' (PBR):
Yellow quilled flowers with chocolate brown centres in late summer. Compact variety with a delightful vanilla scent. Hardy. Up to 90cm.
[Collect Only]
Solidago x luteus 'Lemore' (Goldenrod 'Lemore'):
A shorter form of Goldenrod with panicles of bright lemon yellow daisy-like flowers. Great as a cutflower. Prefers a sunny spot. Hardy. Up to 60cm.