Furcraea tuberosa (Mill.) W.T.Aiton is one of the oldest described furcraeas — first illustrated by Leonard Plukenet as early as 1696 and formally described as Agave tuberosa by Philip Miller in 1768. Its defining morphological feature, unique within the genus, is its tuberous root system — the character from which both its common and scientific names derive. Native across the Caribbean from Cuba to the Windward Islands, this armed, stemless rosette species has a limited but historically documented use as a fibre plant in Haiti and has recently been recorded as a naturalised invasive in the Mpumalanga Province of South Africa.
Taxonomy and nomenclature
The species was first described as Agave tuberosa by Philip Miller in The Gardeners Dictionary, 8th edition (1768), transferred to Furcraea by William Townsend Aiton in 1811. POWO lists multiple synonyms including Furcraea geminispina, Furcraea interrupta, Furcraea lipsiensis, Furcraea spinosa, Agave campanulata and Yucca superba.
Common names
Tuberous false agave, Karata (Dutch Caribbean).
Morphological description
Furcraea tuberosa is a large perennial succulent, either stemless or with a stem less than 30 cm high. The numerous leaves are arranged in a rosette, ranging from more or less upright to spreading, 1.0–1.8 m long, with marginal reddish-brown teeth about 5 mm long. The inflorescence is a many-branched panicle, 5–8 m tall, bearing numerous ovoid bulbils and flowers approximately 4 cm long with six greenish-white tepals, arranged in groups of three.
The tuberous roots are the key distinguishing feature from all other furcraeas — no other species in the genus produces them. This character is important for taxonomic identification, particularly when distinguishing Furcraea tuberosa from the similar Furcraea hexapetala.
Distribution and natural habitat
Native to the Caribbean: Cuba, Dominican Republic, Haiti, Jamaica, Leeward Islands, Puerto Rico and Windward Islands (POWO). The species grows in the seasonally dry tropical biome on rocky, calcareous substrates in coastal and dry-forest habitats. It is recorded on Saba, Sint Eustatius and other islands of the Dutch Caribbean.
The species has naturalised in the Mpumalanga Province of South Africa, where it spreads via bulbils rather than seed (seed set has not been observed in South Africa). Smith documented its South African naturalisation and provided a key to distinguish it from Furcraea foetida and Furcraea selloa.
Cultivation guide
| Hardiness | −2 to −3 °C / 27–28 °F (USDA zones 9b–10) |
| Light | Full sun |
| Soil | Well-drained; tolerates poor, rocky, calcareous soils |
| Water | Low; drought-tolerant; tolerates coastal exposure |
| Growth rate | Moderate |
| Flowering | Monocarpic |
Furcraea tuberosa is a tough, coastal-tolerant plant adapted to calcareous, rocky, dry environments. It is essentially a frost-free species, with only very brief tolerance of light frost. In areas with winter frost, container cultivation with frost-free overwintering is required. Its tolerance of coastal exposure, poor soil and drought makes it an interesting candidate for seaside gardens in subtropical climates.
Garden data for this species is extremely scarce. The cold-hardiness estimate of −2 to −3 °C is extrapolated from its Caribbean origin and the genus-wide data for tropical furcraeas.
Propagation
By bulbils (abundant on the inflorescence after flowering). Seed set is apparently rare — no seed production has been observed in the South African naturalised populations, where spread is entirely via bulbils.
Pests and diseases
The genus-wide threats apply: root and crown rot in wet conditions, agave snout weevil, scale insects. No species-specific pest data available.
Ethnobotany
In Haiti, Furcraea tuberosa is used for its fibres, from which hammocks and ropes are traditionally made. This is the only documented fibre use for this species.
References
POWO (2026). Furcraea tuberosa (Mill.) W.T.Aiton. Plants of the World Online, Kew.
Smith, G.F. Furcraea tuberosa (Mill.) W.T.Aiton (Agavaceae) recorded as having become naturalised in the Mpumalanga Province of South Africa. [ResearchGate].