Santalum paniculatum

Common Names

Mountain Sandalwood, ʻIliahi, Hawaiian Sandalwood

Summary

Native to Hawaii, Mountain sandalwood is an evergreen tree or shrub with several main stems and a bushy habit, typically 3–10 m tall (up to 20 m) with a crown roughly as wide as tall. It is a hemi-parasite relying on nearby hosts for water and nutrients, with greenish-blue narrowly oval leaves, small fragrant flowers at branch ends, and aromatic heartwood yielding a high‑value essential oil used in perfumery, cosmetics, incense, and aromatherapy; wood is used for carving and scenting coconut oil, and the fruit is a black to purple drupe containing a single seed.

Cultivation requires one or more hosts, tolerates a range of soils but prefers light to medium, well‑drained soils with pH 6.1–7.4 (tolerates 4–7.4); moderate to full sun with a host, and drought tolerance once established. Propagation is seed-based, with fresh seeds that germinate best after nicking at 28–31°C, up to ~90% in ~3 weeks and short seed viability; plant seedlings near hosts and outplant at about 20–25 cm tall. Flowering begins around 3–4 years and becomes heavy from 7–10 years, with flowers year‑round and two peaks; root suckers may appear after cutting; USDA hardiness zones 10–11; the species shows limited invasive potential; seeds are edible but scarce and valued for propagation, while wood/oil yields support high commercial and traditional uses.

Lifecycle

Perennial

Height

9.8–65.6 ft

Spread

10-33 ft

Hardiness Zones

Zones 10-11

Sunlight Requirements

Ideally partial shade, full sun tolerated, full sun possible if attached to a suitable host.

Soil Type

Well-drained, light to medium, slightly acidic volcanic soil

Soil Drainage

Well-drained soil.

Soil pH

6.1-7.4

Bloom Color

Greenish to white blooms, often pale green/cream/tan, with brown, orange, or salmon tinges after opening, and a range from yellow to white

Bloom Time

Spring, Summer, and Fall

Foliage Color

Greenish blue

Fall Foliage Color

No fall foliage color

Leaf Lifecycle

Evergreen broadleaf

Growth Rate

Slow growth, 30–70 cm per year when young.

Seasons of Interest

All year

Propagation Methods

Seeds

Attracts Wildlife

Attracts bees, other insects (pollinators), and birds