Dypsis decaryi - Triangle palm

Dypsis decaryi owes its common name, the Triangle Palm, to the near-perfect geometric arrangement of its leaves, which overlap along three axes. Probably one of the most beautiful palms in the world, its irresistibly striking silhouette is instantly recognisable: its fronds, divided into numerous leaflets, are gracefully arched, forming a magnificent, highly regular fan. Frost-tender and heat-demanding, this stunning plant can realistically only be grown in containers in most regions, to be overwintered in a frost-free, well-lit space.

Dypsis is a member of the Arecaceae family (better known by its former name, Palmae), which includes no fewer than 2,500 species spread across several continents in tropical, subtropical, or warm temperate conditions. There are approximately 144 species of Dypsis, naturally distributed in Tanzania, the Comoros, and Madagascar, and very rarely in France, except perhaps Dypsis plumosa. The species Dypsis decaryi is native to the far south of Madagascar, where the climate is relatively dry tropical, with a wet season in summer, i.e., December-January. It is found in dry to semi-arid forests, as well as in rocky scrublands, at altitudes ranging mainly from 80 to 600 m. Locally known as "laafa", it is unfortunately threatened with extinction in its native habitat due to deforestation and human exploitation, with the remaining natural population estimated at just a thousand individuals. This situation contrasts with its abundance in parks and gardens elsewhere in the world, where its unique appearance is particularly appreciated. In Europe, it can grow in the ground in southern Spain, but its growth there is very slow.

Under ideal conditions, Dypsis decaryi is a fast-growing species that typically forms specimens 6-8 m tall with an almost supernatural geometric perfection, but older specimens (it can live up to 200 years) have developed stipes (false trunks) up to 8 or 10 m tall. The grey stipe has a diameter of between 30 and 50 cm and supports a crown of leaves measuring up to 4.50 m in diameter. Being monoecious, this palm produces inflorescences up to 120 cm long, containing both male and female flowers, which yield large, 1.5 cm diameter fruits, each housing a single seed.
What makes Dypsis decaryi so valuable from an ornamental perspective is the highly original arrangement of its leaves. The foliage of this trihedral palm is oriented along three axes, spaced 120° apart, with the pinnate leaves each inserting at their base into the previous one, thus being perfectly aligned. The leaf blades are finely divided into numerous narrow leaflets (100 to 190), arranged in a V-shape upwards. Measuring around 2.50 m long, the leaves at the centre rise almost vertically, with the subsequent ones becoming increasingly oblique, so that the crown takes on an extremely regular and symmetrical fan-like appearance from any viewing angle. The greyish-green colour of the foliage is also captivating, with some specimens even displaying a bluish-grey hue in the tropics. Another remarkable feature of this species is the presence of long, thread-like filaments hanging from the lower leaflets... During its early years, this palm has a triangular base, formed by the remnants of old, shed leaves, but gradually the relatively massive stipe emerges from the soil and lifts the crown into the air.

Dypsis decaryi is an exceptional palm that must be grown in containers in our latitudes and can spend the warmer months outdoors. It will be perfect in a contemporary setting or for creating an exotic atmosphere. Pair it with other equally striking plants to ensure it doesn't steal the show and overshadow everything around it. The evocatively named Beaucarnea recurvata, or Elephant's Foot, will have enough personality to hold its own, with its swollen base, fissured grey bark, and stems topped with a dense tuft of filamentous leaves. Agaves, with their rosettes of leaves that also flirt with geometric perfection and come in green, grey, or blue depending on the species, will also make excellent companions.