RANUNCULUS aconitifolius 'Flore Pleno'

Masses of long lasting double white, button flowers on tall stems above dark green foliage in late spring and early summer. Part or full shade Height 60cm Spread 45cm 
RHS Award of Garden Merit

RHODIOLA rosea

Hardy perennial with yellow flowerheads in summer. Suitable for a rock garden or the front of a mixed border. Likes sun. Height 12in. Spread 8in. 

RHODIOLA wallichiana

Fleshy leafed stems ending in clusters of yellow flowers. Early summer. Height and spread 30cm Sun

RODGERSIA pinnata 'Superba' 

Rich bronze leaves and feathery plumes of pink flowers  in summer. Height up to 1.2m Spread 75cm. Shade or half shade and moist soil. 
RHS Award of Garden Merit

RODGERSIA sambucifolia

Pinnate leaves and elegant creamy white flowers in early to midsummer. Height and spread 90cm

ROMNEYA coulteri

'Tree Poppy'. Large cup-shaped white flowers with gold stamens over a long period in summer Height 1.2m. Sunny sheltered site.
RHS Award of Garden Merit

Rich purple flowers in late summer and autumn Height 35cm Spread 15cm Part shade

Pale yellow orchid-like flowers with crinkled edges from May. Sun or part shade. Height 35cm Spread 15cm
RHS Award of Garden Merit

'Black-eyed Susan'. Large, golden yellow flowers from late summer to mid-autumn. Sun or part shade. Height 60cm Spread 45cm 
RHS Award of Garden Merit

RUDBECKIA occidentalis 'Green Wizard' 

An unusual plant with bright green sepals and a central, almost black cone in summer. Height 1.2m Spread 60cm Sun or part shade