Ranunculus aconitifolius 'Flore Pleno' has delicate, double pom poms in masses and a lovely common name: fair maids of France.

Ranunculus Amandine 'White' is an improved Persian buttercup on strong stems with large pure white flowers.

Ranunculus Aviv White is a Persian buttercup with creamy white flowers.

Rheum palmatum is an ornamental rhubarb with huge leaves, often flushed with red beneath.

Rheum rhabarbarum 'Canada Red' is a culinary rhubarb with short, tender stalks that are bright red, tender, very sweet and juicy.

Rheum rhabarbarum 'Glaskin's Perpetual' is a culinary rhubarb with short, tender stalks that are bright red, tender, very sweet and juicy.

Rheum rhabarbarum 'Red Champagne' is an old variety of rhubarb with long red stems that are tasty sweet and an early producer.

Rhipsalis cereuscula is a fascinating, epiphytic cactus with light-green stems that have a striking resemblance to rice grains.

Rhododendron 'Boule de Neige" midseason flowers are pure white.

Rodgersia aesculifolia offers large clumps of big, bold, textured, palmate foliage that makes a great shady focal point.

Rodgersia 'Bloody Wheels' has stunning foliage that emerges bright, boisterous red deepening to bronze with sharply serrated edges.

Romneya coulteri or Matilija poppy has incredible, crepe-paper thin, pure white petals with large yellow centres atop bluish foliage!

Rosa 'Oscar Peterson' has wonderful semi-double flowers in pale yellow and bright white. Hardy to zone 3!

Rosa 'Cloud 10' is a pure white climbing rose with a blush of cream at the centre and an exotic musk scent.

Rosa 'Claire Austin' is a David Austin shrub or climbing rose with creamy white blooms with strong myrrh fragrance. Part shade tolerant.

Rosa 'Desdemona' is a David Austin rose that open to pure white blooms after an early pink flush with strong fragrance.

Rosa 'Desdemona' is a David Austin rose that open to pure white blooms after an early pink flush with strong fragrance.

Rosa 'Fair Bianca' is a David Austin shrub rose bearing white deeply cupped blooms with strong myrrh fragrance.

Rosa Lichfield Angel' is a David Austin rose shrub with creamy-peach rosettes and light musk fragrance. Zone 4 hardy!

Rosa 'Rose-Marie' is a David Austin rose shrub with white-cream rosettes and strong myrrh fragrance.

Rosa 'Susan Williams-Ellis' is a David Austin shrub rose bearing pure white blooms and medium-strong myrrh fragrance. Zone 4 hardy!

Rosa 'Tranquility' is a David Austin shrub rose bearing pure white rosettes with strong old rose fragrance.

Rosa 'Tranquility' is a David Austin shrub rose bearing pure white rosettes with strong old rose fragrance.