San Francisco Bay Area
- Thymus praecox
- Tillandsia cyanea
- Titanopsis calcarea
- Titanopsis hugo-schlecteri
- Titanopsis schwantesii
- Tokidoki “Year of the Pig”
- Trachyandra saltii
- Trachyandra tortilis
- Trachycarpus fortunei
- Trachycarpus wagnerianus
- Tradescantia cerinthoides “Greenlee”
- Tradescantia navicularis
- Tradescantia “Nuevo Leon”
- Tradescantia “Purple Profusion”
- Tradescantia sillamontana
- Tradescantia “Sitara Gold”
- Tradescantia “Sweet Kate”
- Trichodiadema barbatum
- Trichodiadema bulbosum
- Trichodiadema densum
- Trichodiadema mirabile
- Trithrinax acanthocoma
- Tunilla corrugata
- Tunilla erectoclada
- Tunilla soehrensii
- Tylecodon buchholzianus
- Tylecodon dinteri
- Tylecodon paniculatus
- Tylecodon schaeferianus
- Tylecodon wallichii