Adenia olaboensis

Origin
Adenia olaboensis is endemic to Western Madagascar, specifically ranging from the Boina region to the Ambongo-Boina area. It was officially described by René Clere Joseph Henri Clere in 1910. The species is relatively rare in cultivation compared to other Adenia species.

Habitat
In the wild, it thrives in deciduous dry forests and limestone outcrops (Tsingy). It is typically found at lower altitudes, growing in rocky or sandy soils. The plant has evolved a massive, succulent trunk to store water, allowing it to survive the prolonged dry seasons characteristic of western Madagascar’s climate. It often grows as a scandent shrub or a vigorous climber among other vegetation.

Description
Adenia olaboensis is a spectacular pachycaul succulent, highly prized for its prehistoric, massive base and decorative woody texture.

Caudex & Trunk: It develops a huge, swollen, and often conical or bottle-shaped trunk (caudex) that can reach up to 1-2 meters in height in the wild. The bark is striking—typically grayish-green or silvery with distinctive greenish or dark blotches, giving it a "camouflage" or leopard-print appearance.

Stems: From the top of the succulent trunk, slender, vine-like branches emerge. These branches are equipped with tendrils, enabling the plant to climb up to 5-10 meters in its natural canopy.

Foliage: The leaves are deciduous, variable in shape but usually deeply 3-lobed or 5-lobed, bright green, and reach about 5-10 cm in length. They appear during the rainy season and drop off as the plant enters dormancy.

Flowers: It is a dioecious species (male and female flowers on separate plants). The flowers are small, greenish-yellow, and relatively inconspicuous compared to the magnificent trunk.

Cultivation: This is a slow-growing but rewarding species. It requires bright indirect light to full sun to maintain its thick trunk. A well-draining, mineral-heavy substrate is essential. It is cold-sensitive and must be kept warm and completely dry during its winter dormancy to prevent root rot.