Koda Tree

The koda tree (Ehretia laevis) is a small to medium deciduous tree in the borage family (Boraginaceae), native across tropical Asia and extending into tropical Australia and parts of Africa.134 A tree of upland forests and mountain slopes, it is valued in its home range for small timber, a minor edible fruit, and a long record of traditional medicinal use.3 For a homesteader in a frost-free climate it is an unfussy mid-sized tree — though it is worth being honest that detailed cultivation data for it is genuinely scarce, with most of what is reliably known coming from botanical floras rather than horticultural trials.13

How to identify it

The koda tree typically reaches about 10 m tall and is described as moderate to medium-sized, with smooth to slightly uneven, grey to light-grey bark.13 The leaves are simple and alternate, carried on short petioles roughly 1 to 3 cm long, with an entire (untoothed) margin.13 Leaf shape ranges from ovate-elliptic to obovate; the Flora of China gives blades of about 6 to 12 cm by 3 to 8 cm, while Indian descriptions record a smaller 2 to 8 cm by 1 to 4 cm, so size varies with population.123 The foliage is “membranous when young, hard when mature,” the apex obtuse to acuminate and the base rounded to broadly wedge-shaped; the underside carries short hairs in the vein axils while the upper surface is largely smooth.13

The flowers are small, white, and sessile, borne in branched terminal and axillary cymes about 5 to 6 cm across that are densely covered in yellow-brown hairs.13 Each has a calyx around 2 mm with triangular lobes and a nearly wheel-shaped (subrotate) corolla about 3 mm wide, with reflexed lobes longer than the tube and stamens that protrude beyond the petals; in southern China, flowering runs from February to April.1 The fruit is a small drupe, yellow to orange when ripe and only about 3 to 4 mm across, whose wrinkled stone splits at maturity into four single-seeded segments.1 Small entire leaves, white cymose flowers, and tiny four-stoned drupes together separate it from related Ehretia species.13

Native range and climate

Floristic sources record the koda tree from Hainan (China), Bhutan, India, Kashmir, Laos, Myanmar, Pakistan, Vietnam, and Australia; a wider review adds Sri Lanka, Nepal, Burma, and parts of Africa, noting it grows mainly in upland forests and on mountain slopes.13 The International Plant Names Index summarises its native region as tropical Asia and tropical Australia.4 Taken together, it is a tropical-to-warm-subtropical species of South and Southeast Asia reaching into tropical Australia and Africa.134

No source here assigns a USDA hardiness zone, and no frost-tolerance figures were found. Because every documented part of its range is tropical to warm subtropical and essentially frost-free, it most plausibly corresponds to roughly USDA zones 10 to 12 — but that is an inference from its native distribution, not a sourced number, and its cold hardiness beyond such climates cannot be stated with evidence.134

Growing the koda tree

Here honesty matters more than padding. The cited literature is floristic and pharmacognostic rather than horticultural, and no species-specific cultivation protocol was found — no reliably sourced guidance on seed pre-treatment, cuttings, soil type, sun, watering, spacing, or time to maturity.13 Rather than invent figures, this profile leaves them out.

What its ecology does suggest is useful, if limited: as a tree of upland forests and mountain slopes across a tropical-to-subtropical belt, it is adapted to warm, frost-free, sloping hill-country sites.13 A grower in a suitable warm climate would treat it as a hardy medium-sized deciduous tree and establish it from locally collected seed — the most accessible route for a tree whose nursery trade is poorly documented. Spacing, soil, and irrigation are best matched to local conditions rather than to numbers the sources do not support.

Harvest and uses

The koda tree is documented as a source of small timber, a minor edible fruit, and traditional medicine.13 The fruit is the small yellow-to-orange drupe described above, only a few millimetres across — an incidental edible rather than a serious fruit crop — while the wood serves as small timber in its native range.13 No quantified yields (fruit weight, timber volume) or harvest timing beyond the February-to-April flowering window are given in the sources, so none are stated here.13 The research also does not document specific pollinators or seed dispersers for the species.1

Safety and cautions

The koda tree carries a long record of traditional medicinal use in its native range, one of the main reasons it appears in the literature at all.3 That history is not the same as proven, safe treatment: this profile makes no medical claim that the plant treats or cures any condition, and gives no dosages. The fruit is described only as a minor edible, and because species-specific edibility and toxicity data are not provided in these sources, any consumption of the fruit or preparation of the leaves or bark should be approached conservatively rather than on the strength of a general profile. Anyone considering a medicinal preparation — especially while pregnant or breastfeeding, or while taking prescription medication — should seek qualified guidance first.3

Sources

1. Ehretia laevis — Flora of China (eFloras)
2. Ehretia laevis — eFlora of India
3. A Review on Ehretia laevis — pharmacognostic / ethnobotanical review (PDF)
4. Ehretia laevis Roxb. — International Plant Names Index (IPNI)