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 Jasmine
Rock Purslane: umbellata Rock Rose (spp.)
Rock Rose 'Buttercup' Rock Rose 'Goldie Lock'
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 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 Chamomile
'Roman Gold' Japanese Tree Peony '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'