Alluaudia procera

A spiny tree from Madagascar's dry southwest

Alluaudia procera is native to southern and southwestern Madagascar. Upright stems carry paired rounded leaves and sharp spines in regular vertical lines, eventually forming a narrow tree above the surrounding scrub.

Wild plants belong to Madagascar's spiny thickets, where intense sun, heat and long dry periods are interrupted by brief seasonal rain. Leaves can be shed when water is scarce and replaced when wetter conditions return. The succulent stems hold reserves while the dense spines protect new growth in this open, drought-shaped landscape.

Light, drying and root care

Light

Place Alluaudia procera at the sunniest south- or west-facing window available, with its woody stems close to the glass. Acclimate it gradually, since stems and small leaves formed in shade can scorch in sudden heat.

Watering

Water when its mix is dry throughout and the pot feels light. When the plant becomes leafless and growth stops, keep it much drier and water only enough to prevent prolonged root desiccation.

Temperature

Alluaudia procera grows well in steady indoor warmth while in leaf. When the root ball contains moisture, keep the plant frost-free; a dry resting plant tolerates a cooler night better.

Fertilising

Apply a complete cactus fertiliser to Alluaudia procera at a low dose while stems are extending and fresh leaves are opening. Stop when it becomes leafless or water use slows.

Repotting

Repot Alluaudia procera when roots pack the drainage area, the tall plant becomes unstable, water runs through fixed channels or the mix has collapsed. If roots are damaged, allow them to dry briefly before soaking the fresh mix.

Support, pruning, handling and leaf care

A young Alluaudia procera may need one loose stake until its roots anchor, but established woody stems should support themselves. Do not grip or bend the narrow branches while cleaning.

When the Madagascar ocotillo changes shape or drops leaves

• Leaves yellow and fall while the spiny stems stay firm: A dry or cool period can trigger normal leaf loss on this deciduous succulent. Ease back on water while it is bare and wait for fresh buds before resuming active-growth watering; a soft, dark stem is rot, not dormancy.
• New stem sections are thin, pale or leaning: Growth is reaching for stronger light. Move the pot toward a much brighter position in stages and turn it regularly; old stretched sections will remain narrow, so judge the improvement by sturdier new growth.
• The stem base becomes brown and soft: Moisture has remained around roots or stem tissue for too long. Stop watering, unpot the plant and remove every soft section with clean tools; our root-rot guide covers the recovery sequence.
• Small paired leaves sit beside sharp grey spines: This alternating leaf-and-spine pattern is normal for Alluaudia procera, not a pest or malformed growth. Wear sturdy gloves when handling it and place it clear of walkways rather than trying to remove the spines.
• Cottony patches collect between leaves and spines: Mealybugs can shelter where the spines make cleaning awkward. Isolate the pot, use tweezers or a swab to remove visible insects and repeat treatment for hatchlings without scraping the stem.

Alluaudia procera has sharp parts

• Keep this plant away from children and pets because its effects after chewing or swallowing are unclear.
• Sharp spines or rigid plant parts can puncture the mouth, eyes, skin or paws.
• Handle it carefully. Contact a veterinarian or medical professional after a serious injury, especially to the eye.

Who first published Alluaudia procera, and what does the name mean?

The genus Alluaudia honours French naturalist Charles Alluaud. The Latin epithet procera means tall, slender or lofty.

Emmanuel Drake del Castillo established the genus Alluaudia in 1901 in Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences, volume 133, page 240.

Emmanuel Drake del Castillo first described it as Didierea procera in 1903 in Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences, volume 133, page 241. Emmanuel Drake del Castillo later placed it in Alluaudia as Alluaudia procera in 1903 in Bulletin du Muséum d’Histoire Naturelle (Paris), volume 9, page 37.