Aloiampelos ciliaris is the fastest-growing and only truly climbing species in the genus Aloiampelos, a lineage of scrambling succulents long classified within the genus Aloe but now placed in a separate genus based on molecular phylogenetic evidence. Native to the coastal thickets of the Eastern Cape of South Africa, where its flexible stems push through dense bush toward the canopy light, Aloiampelos ciliaris can reach ten metres when supported. Its diagnostic feature is the soft white cilia that fringe the leaf margins and extend around the clasping leaf bases — a character found in no other alooid. Considerably less cold-hardy than Aloiampelos striatula, it is marginal in USDA zone 9b and common only in the best-protected gardens of zone 10a. This article covers the taxonomy, ecology, morphology, cultivation and cold hardiness of Aloiampelos ciliaris, with attention to its behaviour under Mediterranean conditions.
Taxonomy and botanical history
Aloiampelos is a genus of seven species of scrambling succulent shrubs in the family Asphodelaceae (subfamily Asphodeloideae). The genus was formally established by Grace, Klopper, Smith et al. in 2013 (Phytotaxa 76: 7–14), separating the scrambling aloes (formerly Aloe section Macrifoliae) from Aloe sensu stricto on the basis of molecular phylogenetic evidence.
Aloiampelos ciliaris was first collected by the English explorer William John Burchell in 1813, in the Port Alfred district of the Eastern Cape. It was described by Adrian Hardy Haworth in 1825 (Philosophical Magazine and Journal 66: 281). The specific epithet ciliaris comes from the Latin cilia (“eyelashes”), referring to the distinctive soft white hair-like teeth along the leaf margins that extend around the amplexicaul leaf bases — the most immediately diagnostic feature of the species. The generic name Aloiampelos combines Aloe with the Greek ampelos (“climbing plant”).
POWO (Kew) recognises three varieties:
Aloiampelos ciliaris var. ciliaris — the type variety, hexaploid (2n = 42). The most widespread and vigorous form. The only true climbing variety. Widespread in Eastern Cape thicket vegetation.
Aloiampelos ciliaris var. tidmarshii (Schonland) Klopper & Gideon F.Sm. — diploid. Smaller in all respects than the type. Considered the ancestral form from which the type variety developed. Restricted to the Albany thickets of the Eastern Cape, from Addo Elephant National Park through Makhanda (formerly Grahamstown) to East London.
Aloiampelos ciliaris var. redacta (S.Carter) Klopper & Gideon F.Sm. — tetraploid. Intermediate between the other two varieties. Restricted to sand dunes at the forest edge near Qolora Mouth and the Kei River, Eastern Cape. Classified as Vulnerable (VU).
Nomenclatural synonyms: Aloe ciliaris Haw. (1825) — basionym. Aloe ciliaris var. flanaganii Schonland. Aloe commutata Steud.
Common names: “climbing aloe” and “common climbing aloe” in English; “klimaalwyn” in Afrikaans.
Ecology
Native range
Aloiampelos ciliaris is endemic to the Eastern Cape Province of South Africa. According to POWO and SANBI, var. ciliaris occurs from Kariega (formerly Uitenhage) in the south to the mouth of the Kei River in the northeast, within a relatively narrow coastal and near-coastal belt. It is always found near the sea, in frost-free or nearly frost-free areas. The type variety does not extend into the cold interior mountains — that niche is occupied by the closely related Aloiampelos striatula.
Habitats
In its native range, Aloiampelos ciliaris grows in thorny thickets dominated by succulent plants, especially in dry river valleys and ravines of the Eastern Cape coastal belt. It is essentially a semi-epiphytic vine: its long stems push rapidly upward and outward through the thicket canopy, using their strongly recurved leaves as hooks to anchor in the dense surrounding vegetation. SANBI describes it as “climbing to the thicket canopy, producing its showy racemes usually fully extended in full sun” — meaning the base and stems are in shade while the flowering tips emerge into sunlight.
This natural growth habit — roots in shade, stems scrambling through dappled light, flowers in full sun — is the key to understanding the species’ light preferences in cultivation.
Climate in habitat
The Eastern Cape coastal belt experiences a mild, maritime-influenced climate with year-round rainfall and no severe frost.
Winter (May–August): mild. Minimum temperatures rarely drop below 5 °C (41 °F) along the coast. Frost is essentially absent in the core range of var. ciliaris. Occasional light frosts occur inland in the Baviaanskloof area, at the western edge of the range.
Summer (November–February): warm but moderated by coastal breezes. Maxima of 25–30 °C (77–86 °F). Humidity is higher than in the Karoo interior.
Rainfall is distributed throughout the year, with a slight peak in spring and autumn (500–800 mm / 20–31 in per year). This is a critical difference from Aloiampelos striatula, which comes from a summer-rainfall continental climate with severe winter frost.
Naturalisation
Aloiampelos ciliaris has been introduced far beyond its native range through the horticultural trade and has naturalised in numerous regions. Wikipedia and SANBI record established populations in coastal Morocco, East Africa (Kenya — though some doubt exists about this early record), the Canary Islands, the Azores, northern Spain (Asturias), Greece, coastal Australia (nearly every state except the Northern Territory), and the North Island of New Zealand. In Mediterranean Europe, it is a common ornamental in frost-free gardens from the Riviera to Portugal.
Description
Growth habit
Aloiampelos ciliaris is a sparsely branched, climbing succulent shrub — the only true climbing species in the genus. The stems can reach up to 10 m (33 ft) in length when supported, making it by far the longest-stemmed alooid in existence. The stems are slender (8–12 mm in diameter), initially green and covered by the amplexicaul, striated leaf sheaths, which become dry, papery and grey with age, eventually eroding to expose grey bark beneath. The base can develop with age into a rounded, swollen caudex up to 15 cm (6 in) in diameter, bearing grey bark. Roots are shallow, fleshy, and approximately 5 mm in diameter, radiating from the swollen base. Stems lying on the ground root readily at the nodes on contact with soil.
Without support, Aloiampelos ciliaris forms a sprawling, tangled, rather untidy shrub. With support (a trellis, tree, fence or rock face), it becomes a vigorous climber. SANBI describes it as a “well-known fact that climbing plants are rapid growers” — they do not invest energy in woody structural tissue but use surrounding vegetation for support, channelling resources into rapid elongation.
Leaves
The leaves are fleshy, leathery but soft, linear-lanceolate, 5 to 15 cm (2 to 6 in) long and 1 to 3 cm (0.4 to 1.2 in) wide, spirally arranged along the stem with internodes of 15 to 30 mm. They are more densely crowded at the stem tips, forming a loose rosette of approximately 15 cm (6 in) in diameter. The leaves are strongly recurved, which helps anchor the plant in dense vegetation. The colour is medium to dark green.
The defining diagnostic character is the marginal cilia: soft, white, hair-like teeth along the leaf edges that extend completely around the clasping (amplexicaul) leaf base, encircling the stem. This character is unique to Aloiampelos ciliaris within the Aloiampelos genus and within the Alooideae as a whole. The leaf sheaths are conspicuously striped green and white.
An important note: the leaf sap of Aloiampelos ciliaris is not bitter, unlike that of most Aloe species — a reflection of the distinct evolutionary lineage of the Aloiampelos genus.
Inflorescence and flowers
The inflorescence is a simple (unbranched), ascending raceme, 15 to 30 cm (6 to 12 in) long, emerging near the branch tips. The racemes are cylindrical, 5 to 12 cm (2 to 5 in) long, and densely flowered. Profuse-flowering forms have been selected through horticultural selection and are the most commonly available in the nursery trade.
The flowers are tubular, cylindrical to slightly clavate, 28 to 35 mm (1.1 to 1.4 in) long, bright orange-red to scarlet with yellowish-green tips. They are pendulous and rich in nectar. The stamens and style are slightly exserted. Pollination is primarily by sunbirds, with bees also visiting for pollen.
Flowering period
In the wild (Southern Hemisphere), Aloiampelos ciliaris flowers primarily in late winter to spring (July–August), but can flower sporadically throughout the year. In Northern Hemisphere cultivation under Mediterranean climate, flowering occurs mainly from November to April — essentially autumn through spring, with a peak in late winter. Some forms are temperamental and may skip flowering seasons, while selected horticultural forms flower profusely.
Fruit and seed
The fruit is a trilocular, loculicidal capsule, 13 to 18 mm long. Seeds are dark greyish-brown to black, irregularly angled and laterally compressed.
Comparison with two related species
Aloiampelos ciliaris vs Aloiampelos striatula (Haw.) Klopper & Gideon F.Sm.
These two species are the most commonly cultivated members of the genus but differ fundamentally in ecology, growth habit and cold hardiness.
Key differences:
Growth habit and vigour: Aloiampelos ciliaris is a true vine, reaching 10 m, the fastest-growing alooid. Aloiampelos striatula is a dense, branching shrub to 2 m.
Leaf cilia: Aloiampelos ciliaris has distinctive soft white cilia extending around the amplexicaul leaf bases — diagnostic and unique. Aloiampelos striatula has small white marginal teeth, not cilia.
Cold hardiness: the fundamental difference. Aloiampelos striatula is a high-altitude, cold-adapted species that survives −12 °C above ground and resprouts from rootstock after −18 °C. Aloiampelos ciliaris is a coastal, frost-free-zone species that suffers damage at approximately −3 to −5 °C and is killed outright at sustained temperatures below −6 °C (with no reliable rootstock resprouting). This reflects their completely different native climates: cold montane Karoo vs. mild coastal thicket.
Light preference: Aloiampelos striatula demands full sun. Aloiampelos ciliaris tolerates and often prefers partial shade, particularly under hot Mediterranean conditions (see cultivation section below).
Flower colour: Aloiampelos striatula flowers are yellow to orange-red. Aloiampelos ciliaris flowers are bright scarlet-red with green tips.
Aloiampelos ciliaris vs Aloiampelos tenuior (Haw.) Klopper & Gideon F.Sm.
Aloiampelos tenuior (the “gardener’s aloe”) is another widely cultivated scrambling species, known for its profuse flowering and variability in flower colour.
Key differences:
Leaf base: the amplexicaul leaf bases of Aloiampelos ciliaris are prominently ciliate and auriculate (ear-lobe-shaped). Those of Aloiampelos tenuior are not auriculate and are only obscurely lined, without conspicuous cilia.
Leaf colour: Aloiampelos ciliaris has medium to dark green leaves. Aloiampelos tenuior has blue-green (glaucous) leaves.
Flower colour range: Aloiampelos tenuior is highly variable, with red-, orange- and yellow-flowered varieties recognised. Aloiampelos ciliaris is more consistently scarlet-red.
Habitat: Aloiampelos ciliaris is strictly coastal. Aloiampelos tenuior has a broader and more inland distribution, extending from the Eastern Cape into southern KwaZulu-Natal.
Optimal growing conditions
Light
This is the area where Aloiampelos ciliaris differs most notably from most alooids. In its native habitat, the plant grows in thicket shade, with only the flowering tips emerging into full sun. Wikipedia explicitly notes that the species “can experience sunburn during the hottest periods of the day” and “may grow more effectively in shaded areas.”
Under Mediterranean climate conditions, Aloiampelos ciliaris distinctly prefers partial shade — a morning sun or filtered light exposure is significantly better than full, unbroken midday and afternoon sun. Plants grown in full sun in hot Mediterranean locations (southeastern France, coastal California, southern Spain) often show leaf bleaching, reddish stress colouration, and reduced vigour. In partial shade, the foliage remains a rich, healthy dark green and the plant grows more vigorously, though it may produce fewer flowers.
This preference for partial shade is unusual among alooids and reflects the species’ origin in the shaded understorey of Eastern Cape thickets — not on exposed mountain summits like Aloiampelos striatula.
Substrate
Well-draining soil is essential. A standard succulent mix works well: 50–60 % coarse mineral material (sand, perlite, pumice) and 40–50 % organic matter (loam, compost). The species naturally grows in humus-rich soil from the thicket floor — it tolerates richer substrates than most alooids.
Watering
More frequent than for most succulents. The species comes from a year-round rainfall area and benefits from consistent watering during the growing season. Allow the substrate to dry between waterings but do not leave the plant drought-stressed for extended periods. In hot Mediterranean summers, water every 7 to 10 days. In winter, reduce to once every two to three weeks.
Temperature
The comfortable range is 10–30 °C (50–86 °F). Growth is fastest at 20–28 °C (68–82 °F). The plant slows significantly below 10 °C (50 °F).
Support
Aloiampelos ciliaris requires structural support to develop its climbing habit. Without support, it forms a tangled, sprawling mass that can look untidy. A trellis, fence, pergola, mature tree or rock face provides the ideal framework. The stems do not produce tendrils or aerial roots — the plant anchors itself through its recurved leaves hooking onto surrounding vegetation or structures. In gardens, tying the stems loosely to a support may be needed initially until the plant establishes its climbing pattern.
Feeding
Moderate. Apply a balanced general-purpose or succulent fertiliser once or twice during the growing season. The species responds well to feeding with increased growth rate and more prolific flowering.
Pruning
Regular pruning is advisable to control the vigorous growth and maintain an attractive shape. Without pruning, the stems become extremely long and bare at the base. Cut back overlong stems by one-third to one-half in late spring, after the main flowering flush. Pruned material roots easily as cuttings.
Propagation
Stem cuttings are the fastest and simplest method. Cut a stem section 15–20 cm (6–8 in) long, allow to callous for a few days, and plant in well-draining substrate. Rooting is rapid — often within two to three weeks. Cuttings ideally benefit from initial semi-shade. Seed propagation is also straightforward at 20–24 °C (68–75 °F).
USDA hardiness zones
Zones 9b to 11b (most conservative sources). World of Succulents lists zones 9a to 11b, which reflects the theoretical minimum of −6.7 °C (20 °F). In practice, the species is marginal in zone 9b and common only in the best-protected gardens of zone 10a and warmer.
Cold hardiness: documented evidence and Mediterranean experience
Aloiampelos ciliaris is significantly less cold-hardy than Aloiampelos striatula. This is expected from its native ecology: Aloiampelos ciliaris evolved in the frost-free coastal thicket of the Eastern Cape, while Aloiampelos striatula evolved on cold mountain summits. Unlike Aloiampelos striatula, Aloiampelos ciliaris does not have a documented ability to resprout from underground rootstock after severe freezing.
Documented reports
Kew (POWO): explicitly states that the species “will not tolerate frost” and must be grown indoors in frost-susceptible regions such as Britain.
World of Succulents: lists hardiness as USDA zones 9a to 11b, corresponding to a minimum of −6.7 °C (20 °F).
My Garden Guide (Mediterranean source): reports frost tolerance to −3 °C (27 °F) for brief episodes, noting that the species “can be taken outdoors in tropical, subtropical climates and in the warm Mediterranean.”
Succulents and Sunshine: rates it as not cold-hardy below −1 °C (30 °F), recommending container culture in anything colder.
Chicago Botanic Garden: describes it as “hardy enough to be grown outdoors in California in areas with light frost.”
Dave’s Garden (multiple reports from California): growers in Southern California report trouble-free cultivation outdoors year-round. One grower notes providing morning sun and light shade the rest of the day. Several growers emphasise that the plant performs best with regular summer watering.
ResearchGate (Smith & Figueiredo 2021): the formal monograph notes that profuse-flowering forms have become popular in cultivation “in mild-climate parts of the world, for example in Mediterranean Europe and along the central and southern Californian coast.”
Mediterranean France experience
In the sheltered gardens of southeastern France (Var, Alpes-Maritimes), Aloiampelos ciliaris is a common ornamental in zone USDA 10a — the frost-free or near-frost-free microclimate of the immediate coastline and the most protected valleys. In these gardens, it climbs walls, trellises and mature trees, flowering abundantly through autumn and winter.
In zone USDA 9b (the second line of gardens, slightly further inland or less protected), the species is marginal. Young or recently planted specimens are frequently lost during cold winters when temperatures drop to −3 to −5 °C (27 to 23 °F) for even one or two nights. Well-established plants with a developed caudex at the base may survive brief frosts to approximately −4 °C (25 °F), but sustained cold at this level causes stem dieback from the tips downward. Recovery is possible if the base survives, but it is slow and uncertain — unlike Aloiampelos striatula, which reliably regenerates from underground after far more severe cold.
The species also distinctly prefers partial shade under the intense Mediterranean sun of southeastern France. Plants grown in full sun show leaf scorch, loss of the rich green colouration (turning yellowish or reddish), and reduced vigour. A position with morning sun and afternoon shade, or dappled light through a deciduous canopy, produces the most vigorous and aesthetically pleasing specimens.
Summary of survival thresholds
| Condition | Estimated threshold | Outcome |
|---|---|---|
| Sheltered garden, mild coastal zone 10a | 0 to −2 °C (32 to 28 °F) | No damage |
| Sheltered garden, zone 9b, brief frost | −3 to −4 °C (27 to 25 °F) | Tip dieback, base may survive |
| Exposed position or prolonged frost | −5 to −7 °C (23 to 19 °F) | Severe damage, usually fatal |
| Any wet cold below −3 °C | High risk of total loss |
Practical recommendations for Mediterranean gardens
In USDA zone 10a and warmer, Aloiampelos ciliaris is fully reliable in the ground with no protection. Choose a partially shaded position (morning sun, afternoon shade or filtered light) for best foliage quality and vigour.
In USDA zone 9b, treat as marginal. Plant only in the most sheltered microclimate available: at the base of a south-facing wall, under a mature evergreen tree canopy, or in an enclosed courtyard. A fleece cover during announced frost nights extends the plant’s survival margin. Growing in a large container that can be moved under cover during cold spells is a safer strategy. Well-established specimens with a thick caudex at the base have better odds than young plants.
In USDA zone 9a and colder, grow as a conservatory, greenhouse or indoor plant.
Authority links
POWO (Plants of the World Online, Kew): https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77125496-1
PlantZAfrica (SANBI) — var. ciliaris: https://pza.sanbi.org/aloiampelos-ciliaris-var-ciliaris
PlantZAfrica (SANBI) — genus Aloiampelos: https://pza.sanbi.org/aloiampelos
GBIF: https://www.gbif.org/species/9287107
Wikipedia: https://en.wikipedia.org/wiki/Aloiampelos_ciliaris
iNaturalist: https://www.inaturalist.org/taxa/567947-Aloiampelos
Dave’s Garden: https://davesgarden.com/guides/pf/go/57960
World of Succulents: https://worldofsucculents.com/aloiampelos-ciliaris-climbing-aloe/
Llifle: https://llifle.com/Encyclopedia/SUCCULENTS/Family/Aloaceae/29185/Aloe_ciliaris
Bibliography
Grace, O.M., Klopper, R.R., Smith, G.F., Crouch, N.R., Figueiredo, E., Rønsted, N. & van Wyk, A.E. (2013). A revised generic classification for Aloe (Xanthorrhoeaceae subfam. Asphodeloideae). Phytotaxa 76: 7–14.
Smith, G.F. & Figueiredo, E. (2021). Aloiampelos ciliaris var. ciliaris. Flowering Plants of Africa 67: Plate 2362.
Manning, J.C., Boatwright, J.S., Daru, B.H., Maurin, O. & van der Bank, M. (2014). A molecular phylogeny and generic classification of Asphodelaceae subfamily Alooideae: a final resolution of the prickly issue of polyphyly in the alooids? Systematic Botany 39(1): 55–74. DOI: 10.1600/036364414X678044
Reynolds, G.W. (1950). The Aloes of South Africa. Balkema, Cape Town.
Carter, S., Lavranos, J.J., Newton, L.E. & Walker, C.C. (2011). Aloes. The definitive guide. Kew Publishing, Royal Botanic Gardens, Kew.
Van Wyk, B-E. & Smith, G.F. (1996). Guide to the Aloes of South Africa. Briza Publications.
Bornman, H. & Hardy, D.S. (1971). Aloes of the South African Veld. Voortrekkerpers, Johannesburg.
Cousins, S.R. & Witkowski, E.T.F. (2012). African Aloe ecology: A review. Journal of Arid Environments 85: 1–17.
Related articles on succulentes.net covering the genus Aloe and related alooid genera
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Types of aloes: 20 species every grower should know
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Aloe vera Gel: How to Harvest, Use and Store It Safely