Molokai fan palm
Pritchardia Hillebrandii • Hillebrand's loulu • Hillebrand's Pritchardia • Loulu lelo • Loulu • Hawane • Wahane • Noulu
Molokai fan palm in Motion
The Essence
"Pritchardia hillebrandii survives in the wild largely because a pair of sea stacks kept the browsers out. Its remaining wild stands sit on the flat tops of the rocky islets of Huelo and Mokapu off the windward north coast of Moloka'i. Palmpedia reports about 200 palms on the two to three acres atop the Huelo seastack, which rises roughly 200 feet above the ocean (Native Plants of Hawai'i says 200 to 300), where rats and goats are absent; PACSOA puts the figure at over 300. Roughly ten more trees grow on Mokapu. Rats did reach Mokapu, but they have since been eradicated, and the population there is expected to start increasing. As recently as 1976, fifteen plants were found in the valleys and at the base of the north-coast sea cliffs. They may have been cultivated, since they stood at or near sites of human activity, but either way they are gone from there today, goats and rats the likely cause. The species is variable, ranging from plain green-leaved plants to a much-admired 'blue dwarf' form glaucous on both leaf surfaces. Its diagnostic characters are the conspicuously waxy-glaucous blades, sometimes so heavily coated they appear nearly white, inflorescences shorter than or equaling the petioles, and small, roughly globose fruits. It is also one of the easier Hawaiian Pritchardia to grow. PACSOA calls it widely cultivated and fast growing, and Geoff Stein, writing on Palmpedia, calls it one of the most common species in southern Californian collections, though Palmpedia elsewhere notes it is not often available for landscaping. That is how a palm can be well established in cultivation while the IUCN lists it as Critically Endangered at a single location. Both statements are true; they are simply about different things. In Hawaiian use the fruits, called hawane or wahane, were peeled and the seeds' endosperm eaten, with a texture and flavour similar to coconut. Fronds were used for thatching, and trunks for spears and construction posts; trunks were notched to make climbing easier when harvesting fruit and fronds, and old palms still carry the notches. Seeds were likely strung for lei, and leaves may also have been made into fans, umbrellas, hats and baskets, though those uses were probably uncommon until after Western contact in 1778. Palmpedia relays a striking account from Audrey Sutherland's Paddling My Own Canoe: early Hawaiians are said to have climbed Huelo Islet, cut suitable fronds, attached them like wings, and jumped to glide to the ocean more than a hundred feet below."
The genus Pritchardia honours William Thomas Pritchard (1829-1907), the first British consul in Fiji and author of Polynesian Reminiscences (1866). The epithet hillebrandii honours William (Wilhelm) Hillebrand (1821-1886), a Prussian physician and plant collector who lived in Hawai'i, though NTBG and one sentence within the same Palmpedia paragraph instead give the honouree as W.F. Hillebrand (1853-1925). The Hawaiian name loulu lelo means literally 'yellowish loulu' and is specific to this species; Native Plants of Hawai'i suggests it may refer to the abundant golden-yellow flowers. Named by Odoardo Beccari and first published in Malesia 3: 292 (1890). POWO lists five synonyms: Eupritchardia hillebrandtii, Styloma hillebrandii and Washingtonia hillebrandii (homotypic), plus Pritchardia insignis Becc. and Styloma insignis (heterotypic).
Hillebrand planted much of what he collected at Queen's Hospital and on his own Nu'uanu property on O'ahu, which after his return to Germany was sold to his neighbours Thomas and Mary Foster; it is today Foster Botanical Garden, where several Pritchardia hillebrandii still grow. The type provenance is murky: it is unclear whether Hillebrand's type material came from cultivated plants in Honolulu or from wild or cultivated plants on Moloka'i, and Beccari (1890) noted much confusion around the provenance and labels of Hillebrand's specimens at Berlin. Rock (1921) described a 'robust' variety with very large leaves cultivated near Kamalo on Moloka'i, though he suspected the size might be down to soil. Reintroduction is now under way in fenced areas at Kuka'iwa'a Point on Moloka'i by naturalist Bill Garnett.
Natural Habitat
A tree that grows primarily in the wet tropical biome (POWO), classified by the IUCN simply as terrestrial forest between 30 and 600 m, in a single location on the windward coast of Moloka'i. NTBG describes moist to wet forests from 100 to 1,900 ft on that windward coast; POWO gives the native range as the Hawaiian Islands (N. Molokai), and PACSOA narrows it to the islet of Huelo. In practice it is now effectively restricted to the tops of the stack-like rocky islets of Huelo and Mokapu at roughly 75-100 m elevation, ground that is free of introduced goats and, on Huelo, of rats. It grows near the ocean and tolerates salt spray.
Specimen Gallery Under Curation
Discovering authentic visual assets in the field...
Biology & Morphology
"Solitary-trunked costapalmate fan palm, to about 8 m tall at most and typically around 20-25 ft in cultivation, with strongly undulate, conspicuously waxy-glaucous grayish-green blades divided 2/5-1/2, inflorescences of one to five panicles shorter than or equaling the petioles, and globose, often keeled fruits 15-22 x 14-19 mm that ripen from yellowish or reddish brown to intensely blue or nearly black."
Morphology
Symmetrical columnar trunk with characteristic leaf-scar patterning and lignified outer cortex.
Adventitious root system spreading radially to maximize hydraulic intake in competitive soil matrices.
Distinctive unknown habit and medium stature providing a unique architectural profile.
Foliage
Vibrant green canopy featuring characteristic frond architecture optimized for photon interception and transpiration efficiency.
Specialized green tissues exhibiting moderate metabolic expansion rates.
Reproduction
Complex inflorescence branching typical of the Pritchardia clade, exhibiting seasonal reproductive synchrony.
Nutrient-dense drupes encased in a fibrous pericarp, optimized for protection and dispersal.
Dormant embryonic tissues with high endosperm density, characteristic of resilient Pritchardia specimens.
Ecology
Active rhizosphere communication with mycorrhizal fungal networks, enhancing phosphorus and micronutrient uptake.
Interlocked with local entomological vectors, primarily Meliponini bees or specialized coleoptera.
Gravity-mediated and animal-vectored dispersal mechanisms ensuring regional genetic distribution.
Germination & Propagation
Germination Timeline
Hydration soak.
Incubation in moist media.
Sprout emergence.
Seed is the only propagation method; CTAHR marks cuttings, division, air layers and grafting as not applicable. CTAHR also reports untreated seed of this species germinating at rates of 30-100% in Obata's germination studies. An alternative to open sowing is germinating about five seeds in moist sterile potting mix or sphagnum moss in sealed bags kept in a dark, warm place for roughly four weeks. Unripe seeds of mature size will usually germinate, though more slowly than fully ripe seed. Pritchardia species cross-pollinate readily, so CTAHR warns that hybridization may occur where several species are planted near each other; for genetically clean seed, Native Plants of Hawai'i recommends securing a heavy-duty paper bag (not mesh, since palms can be wind pollinated) around the whole inflorescence just before the flowers open.
Cultivation & Care
Light
Full sun. Growers quoted on Palmpedia report it does well in full sun with good drainage and can thrive in full sun near the coast, but wants partial shade at higher elevations and some shade inland; the llifle text reproduced there notes it will tolerate half-day sun. Native Plants of Hawai'i says it grows best with full sunlight for most of the day, while noting young plants in the wild often survive on less; Plant Pono lists full sun; NTBG notes it tolerates sun, average shade and proximity to the sea; and Maui Nui Botanical Gardens gives full sun to light shade.
Water
Sources genuinely disagree. The llifle account reproduced on Palmpedia says it needs regular water and should not dry out between waterings, while a Hawaiian grower note elsewhere on that same Palmpedia page says the opposite, that it needs to dry out between waterings. Native Plants of Hawai'i calls for keeping the subsurface soil moist at all times but says it will grow in the hot dry lowlands if watered regularly, Plant Pono lists it as drought, wind and salt tolerant, and Maui Nui Botanical Gardens places it in the wet to moderately wet category. Both camps agree it should not sit in continually wet, mucky soil, since the roots and lower trunk can rot.
Soil
Likes organic soil but adapts to clay and loam, slightly alkaline or acidic, with good drainage important (Plant Pono, however, states no special drainage is required). Native Plants of Hawai'i reports growing it only in well-draining cinder, clay or organic-dominant soils. Feeding matters: use a complete palm fertiliser with minor elements and sufficient magnesium and potassium, since deficiencies of those two are among the most serious nutritional disorders in palms and are especially critical for potted loulu. Manganese and iron deficiencies show as unhealthy yellowing, mainly on high-pH soils.
None of these sources give a USDA zone or a minimum temperature. The Rare Palm Seeds text reproduced on Palmpedia, echoed by NTBG, says it suits a wide range of climates and will even tolerate cool conditions and a little frost; the llifle text describes it as adapted to tropical and subtropical climates, with young plants more cold sensitive. Geoff Stein reports that essentially all the Hawaiian Pritchardia including this one do fine in southern California, but that intense dry heat over 100F is hard on it. Growth is slow, roughly a foot a year. Pest pressure includes the Coconut Rhinoceros Beetle, accidentally introduced and established on O'ahu in 2013 and now the most serious threat to cultivated loulu, and the banana moth, whose larvae bore into stressed palms, plus leaf rollers, red spider mites, sugar cane borers, mealybugs and whiteflies; rats eat the fruit.
Pests, Diseases & Care
Pests
Brassolis sophorae (Coconut Caterpillar)
MODERATEDefoliation of pinnate leaflets, reducing photosynthetic capacity.
Manual removal and application of Bacillus thuringiensis (Bt).
Latana camara (Mealybug Vector)
MODERATESap-sucking leading to sooty mold and potential virus transmission.
Ant control and application of horticultural oils.
Diseases
Thielaviopsis punctulata (Black Scorch)
HIGHBlackening and dwarfing of newly emerging fronds.
Wound protection and application of thiophanate-methyl.
Ganoderma zonatum (Butt Rot)
LETHALRadial wood decay and structural instability at the base.
No chemical cure; immediate isolation and removal.
Nutritional Deficiencies
Interveinal chlorosis (Younger fronds)
Chelated Fe-EDDHA Soil Pulse
Marginal chlorosis (Older fronds)
Mg-Sulfate (Kieserite) saturation
Frizzletop / Distorted spear
Systemic Mn-Sulfate application
Care Tips
Biosurveillance pulse synchronized for Global regional vectors.
Apply prophylactic fungicidal drench in the nocturnal phase.
Improve canopy ventilation to disrupt fungal sporulation cycles.
Sources & Conservation
Curated- Pritchardia hillebrandii Becc. | Plants of the World Online, Kew · accessed 2026-08
- Pritchardia hillebrandii | The IUCN Red List of Threatened Species 2023 (Keir, M.) · accessed 2026-08
- Pritchardia hillebrandii - Palmpedia, Palm Grower's Guide · accessed 2026-08
- Pritchardia hillebrandii - PACSOA Wiki · accessed 2026-08
- Pritchardia hillebrandii - Tropical Plants Database, National Tropical Botanical Garden (NTBG) · accessed 2026-08
- Pritchardia (Loulu) - Native Hawaiian Plant Propagation, University of Hawaii CTAHR · accessed 2026-08
- Pritchardia hillebrandii - Native Plants of Hawai'i · accessed 2026-08
- Loulu lelo (Pritchardia hillebrandii) - Maui Nui Botanical Gardens · accessed 2026-08
- Featured Palm: Pritchardia hillebrandii or Loulu Lelo - The Merwin Conservancy · accessed 2026-08
- Pritchardia hillebrandii - Plant Pono · accessed 2026-08
- GBIF Backbone Taxonomy: Pritchardia hillebrandii Becc. (key 5294624, API record) · accessed 2026-08