Dracaena kaweesakii Wilkin & Suksathan is one of the rarest and most spectacular members of the genus Dracaena, a large group of trees and shrubby plants belonging to the family Asparagaceae. Described scientifically only in 2013 from limestone outcrops in northern and central Thailand, it was almost immediately recognized at international level: in May 2014, the International Institute for Species Exploration (IISE) selected it as one of the “Top 10 New Species” named in 2013, highlighting both its remarkable architectural form and the urgency of its conservation. Known in Thai as Chan nuu or Chan pha krai, this dragon tree stands out within its genus for its extraordinary branching structure, its white-margined leaves, and its striking bright orange stamens. Despite its ornamental potential, Dracaena kaweesakii remains extremely rare in cultivation outside its native range and is considered threatened in the wild.
How to identify Dracaena kaweesakii ?
Dracaena kaweesakii is a tree-sized plant reaching 3 to 12 metres in height at maturity, with a crown diameter roughly equivalent to its height. The trunk base is corky and fissured, and the branching system is exceptionally rich: large specimens can carry several hundred spreading and dividing branches, a trait that immediately distinguishes this species from most other Asian dragon trees, which typically produce no more than around 80 branches. Terminal branches are slender, generally under 2 cm in diameter near the leafy apices.
The leaves are grouped in clusters of 20 to 50 at the tip of each branch. Each leaf blade measures 110 to 605 mm long and 9 to 31 mm wide, with a texture ranging from thickly chartaceous to thinly coriaceous. A narrow white margin approximately 1–2 mm wide, clearly visible when the leaf is fresh, is one of the most reliable identification features of this species; the leaf base is also white when fresh, becoming pale to mid-brown when dry. There is no central costa (midrib) on the leaf blade.
The inflorescence axis is covered in distinctive tuberculate-villous hairs up to 0.15 mm long, often dense and sometimes crisped. Flowers are borne singly and inserted directly on the pedicel articulation (no floral stalk above the articulation point). Tepals are cream-coloured with a green or yellow hue, becoming paler and more translucent toward the margins. The filaments are intense orange, erect, 2.2–3.8 mm long — a character immediately visible and very distinctive in the field. Anthers measure 1.7–2.2 mm long.
Fruits remain largely brown on the infructescence, turning orange only just before or shortly after falling. Seeds are approximately 6–7 mm in diameter, globose to broadly triquetrous, pale brown and smooth but microreticulate.
At higher altitudes (approaching 2,000 m), specimens tend to be shorter with fewer branches and smaller leaves, reflecting adaptation to more exposed montane conditions.
Known hybrids
No natural or horticultural hybrids involving Dracaena kaweesakii have been documented in the scientific literature to date. The species’ extreme rarity in cultivation outside Thailand makes the development of cultivated hybrids unlikely in the near future. Should any hybridization work be undertaken, it would most naturally involve closely related Asian dragon tree species such as Dracaena yuccifolia.
Possible confusion with similar species
The species most likely to be confused with Dracaena kaweesakii is Dracaena yuccifolia Ridl., the geographically closest relative within the Asian “dragon tree” group. Both share a much-branched habit and narrow terminal branches, distinguishing them clearly from other Asian Dracaena species (such as Dracaena cambodiana, Dracaena cochinchinensis, and Dracaena jayniana), which typically produce no more than about ten erect or ascending stems.
Several characters reliably separate Dracaena kaweesakii from Dracaena yuccifolia:
- Habit: Dracaena kaweesakii grows to 12 m with up to several hundred branches; Dracaena yuccifolia rarely exceeds 6 m and has up to about 80 branches.
- Leaf margin: Dracaena kaweesakii has a distinct narrow white margin (ca 1–2 mm) when fresh; Dracaena yuccifolia has a concolorous margin.
- Leaf base colour: white in Dracaena kaweesakii; often yellow-hued or brownish in Dracaena yuccifolia.
- Inflorescence axis: tuberculate-villous (hairy) in Dracaena kaweesakii; virtually glabrous in Dracaena yuccifolia.
- Filament colour and orientation: intense orange and erect in Dracaena kaweesakii; bright white and spreading in Dracaena yuccifolia.
- Fruit colour: brown turning orange at maturity in Dracaena kaweesakii; dull red on the infructescence in Dracaena yuccifolia.
- Distribution: Dracaena kaweesakii ranges from Saraburi north to Chiang Rai and into adjacent eastern Burma; Dracaena yuccifolia is found from Ratchaburi (Thailand) south to Langkawi (Malaysia).
The floral stalk is also absent in Dracaena kaweesakii (flowers inserted directly on the pedicel articulation), whereas it is 0.5–0.8 mm long in Dracaena yuccifolia.
Taxonomy
Dracaena kaweesakii was formally described in 2013 by Paul Wilkin, Piyakaset Suksathan, Kaweesak Keeratikiat, Peter van Welzen, and Justyna Wiland-Szymańska, in the open-access journal PhytoKeys (volume 26, pages 101–112; DOI: 10.3897/phytokeys.26.5335). The original description is based on specimens from Lam San Ti, Khao Wong Chan Daeng, Lop Buri Province, Central Thailand (holotype at QBG; isotypes at BKF and K).
The specific epithet kaweesakii honours Keeratkiat Kaweesak (known as “Toi”), one of the co-authors, in recognition of his extensive knowledge of the Thai Chan species complex.
Within the genus Dracaena, the species belongs to the informally recognized “dragon tree” group of mainland Southeast Asian species, characterized by undifferentiated leaf sheaths, the absence of a leaf blade central costa, free tepals, and free thickened filaments. This group also includes Dracaena cambodiana, Dracaena cochinchinensis, Dracaena jayniana, Dracaena multiflora, and Dracaena yuccifolia.
According to the Plants of the World Online (POWO) database, the accepted name is Dracaena kaweesakii Wilkin & Suksathan, placed in the family Asparagaceae, subfamily Nolinoideae (also referred to as Convallarioideae in older treatments), tribe Dracaeneae, genus Dracaena. No synonyms have been published. The IPNI identifier is 77132456-1.
In the wild
Distribution
Dracaena kaweesakii is known from specimens collected in northern, northeastern, and central Thailand, with documented localities spanning from Saraburi and Lop Buri provinces in the centre to Chiang Rai in the far north. Anecdotal evidence from workers at Doi Ang Khang, on the Thailand–Myanmar border, suggests the species also extends into adjacent eastern Myanmar (Burma), but no herbarium specimens from Myanmar have been formally confirmed.
Habitat and climate
The species grows exclusively on limestone outcrops and karst formations, at altitudes ranging from approximately 550 to 2,000 metres above sea level. It is associated with the wet tropical biome (sensu POWO), experiencing a tropical monsoon to tropical montane climate with a pronounced dry season. Limestone habitats in Thailand typically have thin, often alkaline soils with excellent drainage, and are subject to strong insolation and seasonal drought. The species appears well adapted to these xeric, nutrient-poor rocky substrates.
Conservation status and threats
As of the time of the original species description (2013), the wild population of Dracaena kaweesakii was estimated at fewer than 2,500 individuals, a figure qualifying the species as Endangered under IUCN criteria. The principal threats are the extraction of limestone for concrete production, which directly destroys habitat, and fire. Populations in Saraburi and Lop Buri, located closest to Bangkok, are considered the most vulnerable due to proximity to urban and industrial demand. No formal IUCN Red List assessment has been published for this species to date (as of mid-2025); its conservation status should be verified against the current IUCN Red List.
Outdoor / In-ground cultivation
Dracaena kaweesakii has very limited documented cultivation history outside Thailand, and detailed first-hand horticultural experience with this specific species is scarce. The following guidance is extrapolated from the species’ ecology and from general knowledge of the Asian dragon tree group; it should be treated accordingly.
The species is a strictly tropical plant, native to environments where temperatures remain warm year-round. It is not frost-tolerant. Outdoor permanent cultivation in the ground is viable only in climates where winter temperatures do not drop below approximately 5–8 °C, corresponding broadly to USDA Hardiness Zones 10b–12. Even brief cold spells near 0 °C are likely to cause severe damage or death.
In suitable climates, the species should be given a sunny to lightly shaded exposure, replicating the open limestone outcrops it inhabits naturally. Soil must be extremely well-drained; the species is adapted to thin, alkaline, rocky substrates and will not tolerate waterlogged conditions. A freely draining substrate with a neutral to slightly alkaline pH, enriched with grit or coarse mineral material, is appropriate. Once established, the plant is likely to show good drought tolerance, consistent with its limestone karst habitat. Irrigation should be reduced markedly during the dry season or winter months.
Given its natural habitat, Dracaena kaweesakii may prove more tolerant of alkaline soils than many other Dracaena species, making it potentially suitable for calcareous garden settings in tropical and subtropical regions.
Container cultivation
For growers outside tropical climates, container cultivation is the only viable option. Use a large pot with generous drainage holes and fill it with a free-draining mix — a combination of quality potting compost, coarse perlite, and grit in roughly equal parts works well. The container should be sized to the plant: too large a pot retains excess moisture and promotes root rot.
Place the plant in the brightest indirect light available indoors, or in a sheltered outdoor position during the warm season. Dracaena kaweesakii, like most dragon trees, is sensitive to fluoride in tap water, which causes necrotic leaf tip burn. Using filtered water, rainwater, or water that has been allowed to stand for 24 hours reduces this risk.
Watering should follow a “soak and dry” approach: water thoroughly, then allow the top portion of the substrate to dry out before watering again. In autumn and winter, watering should be reduced considerably. Temperatures should not fall below 12–15 °C even briefly. Overwintering indoors in a warm, well-lit position (minimum 15 °C) is essential in temperate regions.
The growth rate of Dracaena kaweesakii in cultivation is not well documented, but the genus as a whole is slow to moderate growing. Given the species’ remarkable multi-branched adult form, even container-grown young specimens can develop into architecturally striking plants over time.
Propagation
Stem cuttings
As with other Dracaena species, Dracaena kaweesakii can theoretically be propagated from stem cuttings. Two methods are used within the genus: tip cuttings (removing the growing apex with several nodes) and stem section cuttings (sections of bare stem, each capable of producing roots from the base and new shoots from the upper end). Spring and early summer are the preferred seasons. Cutting tools must be clean and sterilized (70% isopropyl alcohol) to prevent disease transmission.
Tip cuttings of approximately 15–25 cm should include at least one node. After allowing the cut surface to dry briefly, dip in rooting hormone powder and plant in a lightly moistened rooting medium (coarse perlite, vermiculite, or a mix of perlite and peat). Maintaining high ambient humidity (by enclosing the cutting under clear plastic) and bottom heat (20–27 °C) accelerates rooting. Roots typically appear after 4 to 8 weeks. Once rooted, gradually acclimate the cutting to normal conditions before transplanting into a standard well-draining potting mix.
Seed propagation
Seed propagation is biologically possible but challenging in practice. Seeds should be sown fresh if available, as Dracaena seeds do not keep well. Pre-soaking in room-temperature water for 3 to 5 days is recommended to improve germination rates. Sow shallowly in a warm, moist seed-starting mix at 20–27 °C. Germination may take 4 to 8 weeks or longer. Seedlings are initially slow-growing and require warm, humid conditions and bright indirect light. Dracaena kaweesakii seeds are not commercially available outside specialist botanical networks in Thailand; obtaining seeds from botanical gardens or specialist collectors is the most realistic route for growers outside the species’ native range.
Pests and diseases
Dracaena kaweesakii is subject to the same range of pests and diseases affecting the genus as a whole. Spider mites (Tetranychus spp.) are the most common pest, particularly in dry indoor environments; they cause pale speckling and fine webbing on the undersides of leaves. Regular misting and maintaining adequate humidity reduce the risk. Scale insects (soft scales and armoured scales) may also colonize stems and the undersides of leaves; they can be treated with horticultural oil or systemic insecticide in severe cases.
Root rot caused by Fusarium species or Phytophthora can develop rapidly in waterlogged conditions; prevention through well-draining substrate and careful watering is far more effective than treatment. Leaf tip necrosis is very commonly caused by fluoride or dissolved salt accumulation in irrigation water rather than by a pathogen; switching to low-fluoride or filtered water and flushing the substrate periodically resolves the problem in most cases.
Mealybugs may occasionally infest the leaf axils and are best removed manually with an alcohol-soaked swab followed by an appropriate insecticide if the infestation is severe.
Cold hardiness
Dracaena kaweesakii is a tropical species with no frost tolerance. Its natural habitat spans altitudes of 550 to 2,000 m on Thai limestone karst, where the climate is tropical to tropical montane — cool nights may occur at higher elevations, but temperatures below approximately 5–8 °C are rare and prolonged frost is absent.
As a general guide applicable to the genus, temperatures below 10 °C cause growth to slow markedly; sustained exposure below 5 °C risks tissue damage; and any frost is likely to be fatal to unprotected plants. Permanent outdoor cultivation in the ground should be attempted only in USDA Zones 10b–12, where year-round temperatures remain reliably above 5 °C. In Zone 10a and below, container cultivation with indoor overwintering is the only safe approach.
No documented testimonials from specialist gardening forums (Palmtalk, IPS forums, etc.) relating specifically to the cold hardiness of Dracaena kaweesakii in outdoor cultivation outside Thailand could be identified. This is consistent with the species’ extreme rarity in cultivation outside its native country. Cold hardiness data extrapolated from other Asian dragon tree species (particularly Dracaena cambodiana and Dracaena cochinchinensis) suggests that even these related species are strictly tropical in their requirements.
Traditional and cultural uses
Within Thailand, Dracaena kaweesakii has a documented ornamental role: the species is valued in Thai horticulture for its extraordinary branching architecture, and specimens are found on the grounds of Buddhist temples across its range. Like most Dracaena species in Southeast Asia, it is culturally associated with good fortune, and planting a dragon tree near a home or temple is considered auspicious. This cultural dimension may contribute to the survival of some temple populations, which benefit from a degree of informal protection.
No medicinal or other ethnobotanical uses specific to Dracaena kaweesakii have been documented in the published literature.
FAQ
Is Dracaena kaweesakii available in nurseries outside Thailand? Not as a commercially cultivated plant. The species is extremely rare in cultivation outside its native country. It may occasionally be available through specialist botanical gardens, collectors’ networks, or seed exchanges. Buyers should ensure the plant material has been legally and ethically sourced.
Can Dracaena kaweesakii be grown as a houseplant? Young plants can be grown indoors in a very bright position, provided temperatures remain above 15 °C and the substrate drains freely. However, the species’ ultimate size (up to 12 m in the wild) and its multi-branched architecture mean that long-term indoor cultivation will be challenging as the plant matures.
Why are the leaf tips of my Dracaena kaweesakii turning brown? Brown leaf tips are most commonly caused by fluoride or dissolved salt accumulation from tap water, low humidity, or cold draughts. Switch to filtered or rainwater, improve air humidity around the plant, and ensure it is not exposed to temperatures below 12–15 °C.
How quickly does Dracaena kaweesakii grow? No specific growth rate data for cultivated plants of this species are available in the published literature. Dragon trees in general are slow to moderate growing. The species’ extensive branching in the wild suggests that full ornamental maturity is achieved over many years.
What makes Dracaena kaweesakii different from other dragon trees? Its most striking distinguishing features are the exceptional number of branches (up to several hundred in mature trees), the narrow white leaf margins visible on fresh foliage, and the intensely orange, erect stamens. These characters, combined with its restricted Thai distribution, make it unique within the Asian dragon tree group.
Reference websites
Plants of the World Online (POWO) — accepted name, classification, distribution: https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77132456-1
International Plant Names Index (IPNI) — nomenclatural data, IPNI ID 77132456-1: https://ipni.org/n/77132456-1
GBIF — Global Biodiversity Information Facility, taxon ID 9578572: https://www.gbif.org/species/9578572
iNaturalist — taxon ID 863453: https://www.inaturalist.org/taxa/863453-Dracaena-kaweesakii
PhytoKeys — original species description (Wilkin et al., 2013, open access): https://phytokeys.pensoft.net/article/1481/
Bibliography
Wilkin, P., Suksathan, P., Keeratikiat, K., van Welzen, P. & Wiland-Szymańska, J. (2013). A new species from Thailand and Burma, Dracaena kaweesakii Wilkin & Suksathan (Asparagaceae subfamily Nolinoideae). PhytoKeys 26: 101–112. DOI: 10.3897/phytokeys.26.5335. [Original description; principal source for morphology, distribution, ecology and conservation status.]
Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8: 215. DOI: 10.1038/s41597-021-00997-6. [Nomenclatural backbone for POWO; basis for accepted name treatment.]
International Institute for Species Exploration (IISE) (2014). Top 10 New Species of 2013. State University of New York College of Environmental Science and Forestry, Syracuse. [Recognition of Dracaena kaweesakii among the top 10 new species named in 2013.]