Alluaudia Humbertii

Alluaudia humbertii
Common Name: Spiny Madagascar Shrub

Alluaudia humbertii is a rare and highly sought-after succulent shrub native to southern Madagascar. Similar in structure to its better-known cousin Alluaudia procera, this species stands out for its densely spined, zig-zagging stems and more compact, shrubby growth habit. The stems are lined with small, rounded green leaves that emerge between pairs of thick, protective spines.

Its unique form and spiny silhouette make it a striking addition to any collection of Madagascar natives, caudiciform plants, or unusual xerophytes. With age, it can develop a beautiful, branched structure ideal for container growing or dry garden focal points.

☀ Light Requirements
Thrives in full sun to very bright light. Outdoors, plant in a sunny, well-drained location. Indoors, it requires strong sunlight—preferably a south-facing window or supplemental grow lights.

💧 Watering Needs
Water deeply only when the soil is completely dry. This species is very drought-tolerant and should be watered sparingly, especially during winter dormancy when it may shed its leaves.

🌡 Temperature Tolerance
Best kept above 50°F. Not frost-hardy—protect from cold, wet conditions. Add a [Heat Pack] when ordering during colder months.

✨ Special Features
• Rare Madagascar Native – Far less common than A. procera
• Compact Shrub Habit – Ideal for pots or bonsai-style training
• Spiny & Leafy – Dramatic contrast between armored stems and soft green leaves

Other Common Names:
None widely used – usually referred to by its botanical name.

This cactus will ship bare root and will be ready to place directly in a well draining soil mix like our Custom Cactus Mix.

Photos in the listings unless otherwise specified are representative of the plant that will be sent to you.
However, Plants grow differently and each plant may vary slightly in shape, size, growth pattern, etc.
Of course, if you receive a plant that you are dissatisfied with please reach out to us. We want to make it right!

If temperatures near you are below 45℉ we highly recommend adding a Heat Pack to your order.
If temperatures where you live will be much lower than 20℉ even heat packs may not work. You may consider waiting until things warm up a bit. We know you love your plants just like we do and we wouldn't want any of them to freeze.