Tanacetum densum var. amani forms evergreen, textured mats of soft, feathery, silver foliage and bright yellow button-like flowers.

Teucrium chamaedrys is a wonderful, low-growing, compact plant with densely packed, attractive, mint-scented leaves.

Teucrium scorodonia 'Crispum', the curly wood sage, offers wonderful textural foliage with crinkled and rippled edges.

Thymus 'Sparkling Bright' is an aromatic herb with variegated light green foliage with white edges and pink flowers.

Tiarella Sylvan Lace has dense, deeply cut, and darkly patterned foliage with large flower heads. Buds are pink opening to white.

Tibouchina urvilleana, or the princess flower, can grow up to five metres tall with spectacular, bright purple-indigo flowers.

Tigridia pavonia is an Iris relative with intriguing, three-petaled flowers with red central spots on flowers in bold, tropical shades of white, yellow, magenta, orange, and red.

Star jasmine, Trachelospermum jasminoides, is a beautiful, evergreen climber with masses of sweetly fragrant, white flowers.

Trachelospermum jasminoides 'Madison' is a more cold tolerant version of the star jasmine hardy to zone 7.

Trachelospermum jasminoides 'Pink Showers' is a special pink form of the normally white star jasmine.

Trachelospermum jasminoides 'Star of Toscane' is a more cold tolerant yellow form of the star jasmine.

Trillium catesbaei is a rare bashful wakerobin with blush pink downward facing blooms and recurved petals.

Trollius 'Alabaster' has semi double, spherical, soft butter yellow flowers. Globe flowers are very hardy and easy to grow.