The sugar palm (Arenga pinnata) is a palm species from the Arecaceae family that grows naturally in tropical Asia, particularly across Southeast Asia. Recognized as one of the most widely utilized palm species, the tree is known by various local names across the region, such as aren, enau, or kabung in Indonesia and Malaysia, kaong in the Philippines, and tao in Thailand.
In its natural habitat, the sugar palm thrives at altitudes between 500 and 800 meters above sea level with an annual rainfall exceeding 1,200 millimeters. Its trunk grows upright without branches, encased in a thick, dark layer of fibers. The plant adapts to various land types, ranging from mountain slopes and riverbanks to agroforestry areas.
The tree possesses a wide array of functions distributed across its main parts. The trunk provides hardwood and a reserve of pith starch. The leaf petioles yield decay-resistant ijuk fibers. Meanwhile, the flower clusters and fruits produce fresh sap and edible food products.
Utilization of Trunk Wood and Starch
The outer section of the sugar palm trunk features a very dense layer of hardwood, with densities ranging between 0.65 and 1.03 grams per cubic centimeter. The wood is resistant to weather changes and wood-boring insect attacks. In the archipelagos of Indonesia and the Philippines, the outer wood is processed into structural posts, floorboards, tool handles, and furniture.
Behind its hard outer shell, the interior pith of the sugar palm trunk stores starch reserves. Extracting the pith produces starch flour, which is traditionally used as raw material for noodles, traditional cakes, or as a substitute for rice flour.
Pelepah Ijuk Fibers as Building Material
The base of the sugar palm leaf petiole is wrapped in thick, dark black fibers known as ijuk. The fibers are rigid, elastic, and resistant to rot, even when exposed to rainwater, saltwater, or termite attacks.
The characteristics make ijuk a preferred roofing material for traditional houses, such as in the architecture of the Rumah Gadang in West Sumatra and temple structures in Bali.
Ijuk fibers are also used to make cordage, ropes, and brooms. Meanwhile, the midribs separated from the leaves are bound into broomsticks or woven into handicrafts, such as woven leaf plates and baskets.
Tapping Flower Sap for Sweet Processed Products
The male flower clusters of the sugar palm yield a sweet liquid known as sap (nira). Tapping is performed by cutting the end of the flower cluster, which has been periodically tapped and swayed beforehand.
A single productive tree can yield fresh sap daily over a production period lasting several months. To prevent the sap from fermenting rapidly and turning sour during collection, crushed ginger or chili is placed inside the collection containers.
In Indonesia, freshly harvested sap can be consumed directly as a sweet beverage known as lahang. The liquid is commonly boiled until it thickens, then molded into block palm sugar or processed into granulated palm sugar.
When fermented, the sap is processed into vinegar, such as sukang kaong in the Philippines. Beyond vinegar, the fermented sap is crafted into traditional beverages like tuak and sageru, which, when further distilled, produce local spirits.
Utilization of Fruit for Consumption
The female flower clusters on the sugar palm produce clusters of dense, round fruits growing in bunches. In Indonesia, the young seeds of the fruit are known as kolang-kaling, while in the Philippines, they are called kaong. The outer skin and raw sap of the fruit contain corrosive compounds that cause severe itching upon direct contact with the skin.
Therefore, sugar palm fruits must be boiled and peeled before the seeds can be harvested. The tender young seeds are processed as ingredients for fruit cocktails (es buah) or cooked with coconut milk and pandan leaves.
In addition to utilizing the seeds, the residual water from boiling the sugar palm fruits can serve as a natural dye for textiles. In the wild, the natural regeneration and dispersal of sugar palm seeds are largely aided by palm civets that consume the ripe fruits.
References:
Hiola, A. S., Hamidun, M. S., & Febryano, I. G. (2026). Systematic literature review on sustainable value chain transformation of Arenga pinnata in tropical bioresource systems. Forest and Nature, 2(2), 67–81. https://doi.org/10.63357/fornature.v2i2.34
Mogea, J., Seibert, B., & Smits, W. (1991). Multipurpose palms: The sugar palm (Arenga pinnata (Wurmb) Merr.). Agroforestry Systems, 13(2), 111–129.
