Turnera ulmifolia YELLOW ALDER (plant)

Caribbean Damiana is a perennial shrub from the Turneraceae family. It is native to Central America and is now found in most tropical regions. While it is commonly called "damiana," the true Damiana remains Turnera diffusa.

The leaves of Turnera ulmifolia are lanceolate to elliptical in shape with a distinctly serrated margin. They are bright green on the top and a paler green on the underside. Arranged alternately along the stems, they feature two small glands at the base of the blade and release a light aromatic scent when crushed.

Its flowers are solitary and develop in the leaf axils. They consist of five bright, luminous yellow petals, forming a wide-open, cup-shaped corolla measuring approximately 4 to 5 centimeters in diameter. A notable characteristic of this plant is that the flowers only open for a few hours in the morning, closing as soon as the light or the afternoon heat becomes too intense.

The fruit is a small ovoid capsule with a slightly rough texture. Upon maturity, this capsule becomes dry and splits into three valves to release its seeds.

Damiana seeds are small, brown, and slightly curved in shape. They are covered by a thin membrane called an aril, which is often attractive to ants, thus promoting the plant's dispersal in its environment.

- Uses:

A Botanical Treasure from the Caribbean and Latin America

Although often overshadowed by its close relative Turnera diffusa, Turnera ulmifolia is a fascinating species native to the Caribbean and Latin America.
This specimen offered by Ethnoplants is part of a rich ethnobotanical and cultural heritage, reflecting the traditional use that local civilizations made of its plant resources.

An Ethnobotanical Tradition and Unique Aromas

At the heart of Caribbean traditions, the foliage of this perennial was traditionally used to brew herbal infusions with herbaceous notes. Today, cultivating Turnera ulmifolia helps preserve a unique plant heritage and explore the fascinating history of characterful plants within your botanical collection.

Tropical Aesthetics and Garden Resilience

Beyond its history, this plant is an ornamental gem. Its bright yellow flowers and dense habit make it an ideal candidate for structuring sunny borders or creating generous ground-cover carpets.
Its vigorous growth and limited maintenance appeal to gardeners looking for a vibrant tropical garden without major constraints.

- Cultivation and Planting:

• Plant the damiana in a 2-liter pot of potting soil.
• Remember to drain the bottom of the pot with clay pebbles.
• Water it immediately upon planting and place it in a sunny spot.
• It is also possible to plant it directly in the ground.

- Soil Type:

Turnera is not demanding regarding soil nature, but it prefers a light, sandy, and above all, very well-drained substrate. A mixture of 70% quality horticultural potting soil and 30% river sand suits it perfectly. It tolerates poor soils and even slightly calcareous (lime-rich) ones.

- Exposure:

To ensure abundant flowering, this plant requires full sun exposure. Since the flowers only bloom under the action of light, a clear, open location is essential.

- Cultivation Temperature:

Native to tropical zones, it is sensitive to cold and thrives ideally between 20°C and 30°C. It does not tolerate frost and begins to suffer as soon as temperatures drop below 10°C. In temperate climates, it is grown in pots to be brought under shelter during winter or treated as an annual plant in summer beds.

- Watering:

Its water needs are moderate as the plant has good drought resistance once established. It is advisable to water regularly during the growth period, while letting the substrate dry on the surface between waterings. In winter, if the plant is kept indoors, watering must be considerably reduced to respect its resting period.

- Propagation:

Reproduction is easily achieved through seeds or cuttings. Cuttings of semi-woody stems, taken in spring or summer, yield excellent results: simply place the stem segments in a light mixture and keep them warm to see the first roots appear within a few weeks.

This article was written by Julien on 07/26/2026.