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:

In Caribbean and Latin American traditional medicine, it is used to treat various health disorders. An infusion of the leaves is frequently employed to relieve gastrointestinal problems, colds, and local inflammations. Although often confused with its close relative, Turnera diffusa (the true Damiana), it possesses similar properties, notably tonic and stimulating effects used to combat fatigue and stress.

Scientific research is interested in this plant for its richness in active compounds such as flavonoids and alkaloids. Studies have highlighted its antioxidant, anti-inflammatory, and especially antibiotic properties, including its ability to enhance the effectiveness of certain drugs against resistant bacteria. In cosmetics, plant extracts are sometimes integrated into skincare products due to their soothing and protective virtues against oxidative stress.
Do not consume without medical advice from a healthcare professional.

Due to its yellow flowering and robust growth, it is highly prized as an ornamental plant in tropical and subtropical gardens. It is ideal for forming borders or dense groundcovers that require little maintenance.

- 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.