Spiranthes odorata, marsh lady's tresses[1] or common lady's tresses,[2] is a species of flowering plant in the orchid family, native to the southeastern United States, from Texas eastwards and northwards to Delaware.

[1] It grows in moist, partially shaded environments with acidic or neutral soil.

The flowers, which appear in late summer and autumn, are white, hooded and fragrant (hence the specific epithet odorata).

[3] In the UK, the cultivar 'Chadd's Ford' has gained the Royal Horticultural Society's Award of Garden Merit.

[4][5] Requiring a fertile soil in partial shade, it is hardy down to −10 °C (14 °F), but in frosty areas needs a dry mulch during the winter months.