Rock Anise Hyssop 'Rock' Florist's Chrysanthemum
Rock Garden Pink (spp.) Rock Garden Pink 'Bath's Pink'
Rock Garden Pink 'Dottie' Rock Garden Pink 'Mountain Mist'
Rock Garden Pink 'Pixie' Rock Garden Pink 'Spotty'
Rock Garden Pink 'Tiny Rubies' Rock Geranium (spp.)
Rock Geranium 'Ruby Veil' Rock Isotome
Rock Jasmine Rock Purslane: umbellata
Rock Soapwort Rock Stonecrop
Rockcress (spp.) Rockcress 'Skyrocket'
Rockcress, False (spp.) Rockcress, False 'Snow Cap'
Rockcress, False 'Whitewell Gem' Rockcress, Fringed 'Spring Charm'
Rockcress, Mountain Rock (spp.) Rockcress, Mountain Rock Variegated
Rockcress, Purple (spp.) Rockcress, Purple 'Snow Cap'
Rockcress, Purple 'Whitewell Gem' Rockcress, Rainbow (spp.)
Rockcress, Rainbow 'Snow Cap' Rockcress, Rainbow 'Whitewell Gem'
Rockcress, Wall (spp.) Rockcress, Wall Variegated
Rockcress: ferdinandi-coburgi 'Old Gold' Rockcress: libanotica
'Rocket City' Daylily Rocket Larkspur
Rockfoil Rockgarden Iris
Rocky Mountain Columbine (spp.) Rocky Mountain Columbine 'Red Hobbit'
Rocky Mountain Penstemon Rocky Mountain Sage
Rocky Mountain Zinnia Rocky Point Ice Plant
Rocky Point Ice Plant: lutea 'Rocky Point' Western Blue-eyed Grass
'Rocky Top Hybrids' Tennessee Coneflower Rodgersia
'Rolf Fiedler' Spring Starflower 'Roma' Asiatic Lily
'Roman Candy' Ivy Leaf Morning Glory Roman Chamomile
'Roman Gold' Japanese Tree Peony Roman Wormwood
'Rominette Pink' English Daisy 'Ron McBeath' Cinquefoil: nepalensis
'Rondo' Bearded Tongue 'Rootbeer' Daylily
Rooting Chain Fern 'Rosa deNoche' Waterlily
'Rosalba' Red Hot Poker: bracteata 'Rosalie' Alumroot: Heuchera
Rosary Plant Rosary Vine
Roscoea 'Beesiana'