Scientific Name (Genus/Species): Tagetes lemmonii

Family: (Asteraceae)

TP to 5′.  Mexican Marigold.  Arizona and Northern Mexico.  The finely divided, olive-green leaves of this very tall and unusual Marigold emit the classic Marigold scent tinged with lemon and mint.  Orange-yellow, daisy-like flowers are up to 1-½ inches wide and have a slightly darker disc in the centre.  In its native habitat it grows as an evergreen shrub in lean, dry soils.  As a container plant at Stonecrop, it does well in full sun or partial shade.  Blooms mid-spring to early summer with sporadic flowers again in autumn.  Well-drained soil.  3 & T2.

Scientific Name (Genus/Species): Talinum paniculatum

Family: (Portulacaceae)

(A) to 2.5′.  Jewels-of-Opar.  Southeast United States to Central America.  Many slender flower stalks bear panicles of shiny, red-orange, three-part buds followed by tiny, rose-red, ¼-inch flowers containing 15-20 stamens.  Jewel-like, ruby-orange, rounded berries that eventually turn black.  Very succulent, dark green, opposite leaves add to this oddity.  Sun.  4 & T3

Scientific Name (Genus/Species): Tanacetum niveum

Family: (Asteraceae)

(TP) to 2-½’.  Silver Tansy.  A short-lived perennial with silver-grey, deeply cut, fragrant foliage that is covered with masses of ½ inch, white, daisy-like flowers with yellow centres.  Midsummer.  Delicate yet striking.  Sun.  4 & T2

Scientific Name (Genus/Species): Tanacetum parthenium

Family: (Asteraceae)

(P) to 2′.  Feverfew.  Europe.  A short-lived perennial with lovely pale green foliage.  Flowers are small white daisies.  Feverfew sandwiches are good for migraines!  Sun.  4 & T2

Scientific Name (Genus/Species): Tellima grandiflora

Family: (Saxifragaceae)

(P) to 2′.  Fringe Cups.  Western North America.  Racemes of lime-green, bell-shaped, filigreed, fragrant flowers turning delicate pink with age.  Basal leaves are softly hairy.  Partial shade.  4 & T1

Scientific Name (Genus/Species): Teucrium hircanicum

Family: (Lamiaceae)

(P) to 2′. Wood Sage. This native of Persia has orchid-purple, hooded flowers with bell-shaped bracts that bloom on stiff spikes throughout summer. Aromatic, bright green leaves are ovate, notched, and puckered. Moist soil. Sun. 3 & T2

Scientific Name (Genus/Species): Teucrium scorodonia

Family: (Lamiaceae)

(P) 18″.  Wood Germander.  A tough, shrubby perennial native to dry, open, pine woods, scrub, heaths and sandy acidic soils throughout Western Europe.  Aromatic, notched and puckered, sage-like, wrinkled green leaves adorn dense clumps of stiff, branching, woody stems.  Masses of tiny, greenish yellow lipped blooms cover, short, loose spikes in mid to late summer.  Dry, lime free soil.  Sun. 3 & T2

Scientific Name (Genus/Species): Thalictrum chelidonii

Family: Ranunculaceae

(P) to 6′.  Himalayan Meadow Rue.  A tall and elegant Thalictrum with cupped, pale purplish pink flowers bearing prominent stamens with yellow anthers.  Lovely, purple burnished foliage with variable ovate leaflets.  Great in dappled sun to part shade.  Best in rich, humusy soil.  3 & T1 & Δ

Scientific Name (Genus/Species): Thalictrum minus

Family: (Ranunculaceae)

(P) to 2.5′.  Europe.  This choice Meadow Rue has foliage very similar to Maidenhair Fern with sprays of light yellow, apetalous flowers.  Dainty yet tough.  Tolerates partial shade.  3 & T1 & Δ

Scientific Name (Genus/Species): Thalictrum pubescens

Family: Ranunculaceae

(P) to 7′.  King of the Meadow.  Eastern US and Canada. This native beauty has tall panicles of apetalous flowers with white, thread-like, stamens that form a cloud-like fluff and tower over blue-green, Columbine-like leaves.  The foliage turns bright yellow in the fall.  Use in the back of borders, native gardens, and moist woodlands.  Blooms spring to summer.  Shade to part shade.  Medium to wet, well-drained, organically rich soil.  3 & T1

Scientific Name (Genus/Species): Thalictrum rochebruneanum

Family: (Ranunculaceae)

(P) to 6′.  Lavender Mist Meadow Rue.  An incredible architectural beauty from Japan.  Loose panicles of deep lavender-violet, apetalous flowers with yellow stamens bloom throughout the summer months.  Enjoys full sun or partial shade.  3 & T1 & Δ

Scientific Name (Genus/Species): Thermopsis villosa (syn. Thermopsis caroliniana)

Family: (Fabaceae)

(P) to 5′. Carolina Lupine. Southeastern United States. Tall spikes of bright-yellow, pea-like flowers over loose clumps of glaucous, softly downy foliage with three-part, clover-like elliptical leaflets. Blooms in early summer. Well-drained soil. Sun. 1 & 2B then 3 & T2

Scientific Name (Genus/Species): Tibouchina urvilleana

Family: (Melastomataceae)

(TP) to 12′. Princess Flower, Glory Bush. Brazil. The silky, saturated purple blooms are the best. These showy, five-petalled flowers appear on terminal, three-forked panicles and display long, purple stamens. Fresh green, ovate, and acute leaves have prominent, parallel veins and are felted with soft, white hairs. Cool temperatures cause the leaves to change colour to blushed peach to red. We have a handsome specimen in a warm greenhouse and we love adding smaller plants to the flower beds, and grow many in pots. Moist soil. Sun. 3 & T2

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Scientific Name (Genus/Species): Trachelium caeruleum

Family: (Campanulaceae)

(A or TP) to 3′.  Blue Throatwort.  Mediterranean.  Large, umbellate clusters on upright stems bear many small, five-petalled flowers dotted with a white exserted style that looks like a tiny white pin.  The flowers are a vibrant violet and lightly scented.  Attractive dark foliage is toothed with purple veins. A long bloomer that makes a great cut flower.  Sun with afternoon shade.  Well-drained soil.  4 & T1

Scientific Name (Genus/Species): Tradescantia subaspera

Family: (Commelinaceae)

(P) to 3′. Zigzag Spiderwort. Missouri. Broader leaves and the distinctive zigzag stem set it apart from the old faithful T. virginiana. Terminal clusters of numerous flower buds open daily to large, violet blue, three-petalled flowers that are highlighted by the yellow anthers atop long, hairy, blue filaments. We cut the foliage in half after flowering to prevent flopping and encourage new growth and possible repeat blooms. After cutting back a viscous secretion is released from the stem, which hardens to become thread-like and silky-like the web of a spider. Ours is growing on the Order Beds in full sun and good soil. A long bloom time from May to August. 3 & T1