Weldenia is a monotypic genus of flowering plants in the family Commelinaceae, first formally described in 1829.

It has one single species: Weldenia candida,[3] which grows natively in Mexico and Guatemala.

The central, three-petalled, bright white flowers are borne over a long period in late spring and summer.

Hardy down to −5 °C (23 °F), in temperate zones it prefers mild sheltered locations in full sun, with neutral or acid well-drained soil.

[6] It requires dry conditions over winter, so is best grown in an alpine house or similar, where protection can be provided.