Alluaudia (Alluaudia montagnacii)

General Plant Information (Edit)
Plant Habit: Tree
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Dry Mesic
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 9b -3.9 °C (25 °F) to -1.1 °C (30 °F)
Plant Height: Up to 7-19 feet
Plant Spread: 1-2 feet
Leaves: Deciduous
Other: interesting arrangement of symmetrical leaves winding around stem
Flower Color: Bi-Color: White and yellow
Bloom Size: Under 1"
Suitable Locations: Beach Front
Uses: Guardian plant
Resistances: Drought tolerant
Salt tolerant
Propagation: Other methods: Cuttings: Stem
Other: Stem cuttings easily rooted in spring or summer
Containers: Suitable in 3 gallon or larger
Needs repotting every 2 to 3 years
Needs excellent drainage in pots
Miscellaneous: With thorns/spines/prickles/teeth
Goes Dormant


Posted by Baja_Costero (Baja California - Zone 11b) on Feb 28, 2017 10:19 PM

Spiny Madagascar succulent which will grow to the height of a tree, roughly like a telephone pole with occasional branches. This genus, mostly from the southwestern spiny forest, behaves like the New World ocotillos (Fouquieria spp.). Both have deciduous leaves, spiny whip-like stems, and showy flowers on the end of those stems.

In cultivation this Alluaudia may or may not enter winter dormancy (spines near the tips are greenish and rubbery soft during active growth), depending on conditions. When in active growth, water it like a tree, not a cactus. Seriously underpotting will retard growth several fold. Provide excellent drainage and repot in spring or when new growth is evident. May be forced to branch by beheading. Cuttings can be easily rooted.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Cactus and succulents chat by Baja_Costero Jan 14, 2021 7:25 PM 9,297
adamgreen's seed thread. by adamgreen Jan 25, 2015 6:53 AM 254

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