Plants
- Rambling Rose 'Gardena'
- Ranunculus Montana WilldRanunculus Montana Willd
- Rape Brassica napus
- Raphanus sativus subsp. nigerRaphanus sativus subsp. niger
- Raphanus sativus var sativus 'Gaudry'Raphanus sativus var sativus 'Gaudry'
- Raphanus sativus var. nigerRaphanus sativus var. niger
- Real YellowwoodPodocarpus latifolius
- Red BistortPersicaria amplexicaulis
- Red hot poker 'Ice Queen''Kniphofia Ice Queen
- Red hot poker 'Jenny Bloom'Kniphofia 'Jenny Bloom'
- Red hot poker 'Mount Etna'Kniphofia Mount Etna
- Red hot poker 'Prince Igor'Kniphofia 'Prince Igor'
- Red hot poker 'Torchbearer'Kniphofia 'Torchbearer'
- Red Hot Poker, Torch Lily 'Buttercup'Kniphofia Buttercup
- Red hot poker,'Shining Sceptre'Kniphofia 'Shining Sceptre'
- Red hot poker,'Sunningdale Yellow'Kniphofia 'Sunningdale Yellow'
- Red hot poker. 'C.M Prichard'Kniphofia rooperi
- Red hot poker. 'Little Maid'Kniphofia Little Maid
- Red orache, Mountain SpinachAtriplex hortenis var. rubra
- Redshank Persicaria maculosa
- Rhododendron 'Elisabeth Hobbie'Rhododendron 'Elisabeth Hobbie'
- Rhododendron 'Unique'
- Ribbed MelilotMelilotus officinalis
- Ribes rubrum 'cerise blanche'Ribes rubrum 'cerise blanche'
- Ribes rubrum 'Stanza'Ribes rubrum 'Stanza'
- Ribes rubrum 'Zitavia'Ribes rubrum 'Zitavia'
- Ribes rubrum (cultivars)Ribes rubrum (cultivars)
- Robinia hispidaRobinia hispida
- Robinia pseudoacacia aureaRobinia pseudoacacia aurea
- Robinia viscosaRobinia viscosa
- Rock rose 'Mrs C.W. Earle'Helianthemum lunulatum 'Mrs C.W. Earle'
- Rock rose 'Rhodanthe Carneum'Helianthemum nummularium 'Rhodanthe Carneum'
- Rock rose. 'Tomentosum'Helianthemum nummularium 'Tomentosum'
- Rockrose 'St. John's College'Helianthemum 'St. John's College'
- Rodgersia 'Superba'Rodgersia pinnata 'Superba'