Rodgersia sambucifolia

Roscoea humeana

Roscoea purpurea 'Spice Island'

Roscoea tumjensis

Rubus cockburnianus

Rubus phoenicolasius

Ruta graveolens

Sabal minor

Salvia uliginosa

Sapindus mukorossi

Sarcococca hookeriana var. humilis

Sarcococca orientalis

Sarcococca ruscifolia

Sarcococca ×confusa

Scabiosa columbaria

Sedum telephium 'Purpursonne'

Sibbaldiopsis tridentata (Potentilla tridentata)

Sisyrinchium macrocarpum

Sisyrinchium striatum

Smilacina japonica

Symphytum tuberosum

Thelypteris kunthii

Toona sinensis

Trachycarpus fortunei 'Chaubattia'

Trachycarpus martianus

Trachycarpus martianus ssp. latisectus

Trachycarpus takil

Trachycarpus wagnerianus

Trithrinax campestris

Tulbaghia coddii

Tulbaghia galpinii

Tulbaghia natalensis

Tulbaghia violacea

Tupistra jinshanensis

Umbellularia californica

Uvularia grandiflora