Wild Olive

Wild olive (Olea ferruginea, kahu) is the native sub-Himalayan olive of the Pothohar scrub and the dry hills of KPK and Balochistan. It is a hardy mid-succession tree that yields fruit, oil, fodder, and firewood, and it is also the rootstock that Pakistan’s commercial olive industry is grafted onto. For a syntropic system on dry, marginal ground, kahu is a tough, productive secondary-stage tree with an unusual second life as a grafting base, native resilience now and improved fruit later.

Where it thrives

Kahu grows across the dry-temperate and moist-temperate zones of Pakistan from about 500 to 2,000 m, and up to roughly 2,400 m in the wider Himalaya from Kashmir eastward.¹ It needs adequate rainfall, on the order of 600 mm, but is otherwise undemanding and will hold marginal and waste ground where many trees fail.² That toughness is the point: it is a tree for the dry foothills, the Pothohar scrub, and degraded slopes, not for irrigated flats, and it has historically formed open woodland across exactly the kind of stony, low-fertility ground that defeats softer fruit trees.

Role in the system

As a secondary-stage species, kahu fills the middle of the succession on dry ground, putting an evergreen, fruit-bearing tree onto sites that pioneers have started to stabilise. It carries a real annual yield, fruit and oil for the household, leaf fodder for stock, and firewood, while it shades and holds the slope.² The fruit is smaller and lower-yielding for oil than cultivated olive, so on a subsistence guild it earns its place more as a hardy multipurpose tree than as an oil crop on its own.³ Its real strength in the system is that it survives where the productive species you actually want cannot yet, and then becomes the frame you build them onto.

Establishment

The standout option is grafting. Cultivated olive is propagated vegetatively, by cuttings or by grafting, and wild kahu has long been used as the rootstock onto which improved olive varieties are worked.³ In the Pothohar, the Barani Agricultural Research Institute at Chakwal has built much of Pakistan’s olive push on this approach, planting hundreds of thousands of trees, supplying free saplings to farmers, and releasing local selections such as the BARI Zaitoon varieties.⁴ So you can establish kahu as a hardy native, let it root into difficult ground, then graft it over to a fruiting cultivar once it is well away.

What you get

Edible fruit and a modest oil yield, quality leaf fodder, and good firewood from the wild tree, plus the option to convert it into a productive table or oil olive by grafting.² That flexibility, native toughness first, improved fruit later, is what makes kahu such a practical secondary-stage choice for the dry north, and it is the reason the species sits at the base of a fast-growing Pothohar olive sector rather than being treated as a weed of the scrub.³

Sources

1. Khan, M., et al. (2014). “Composition, structure and regeneration dynamics of Olea ferruginea forests from the Hindukush range of Pakistan.” Journal of Mountain Science.
2. Bhatt, I. D., et al. (2012). “Olea ferruginea Royle, Indian olive: an underutilised fruit tree crop of north-west Himalaya.” Fruits (EDP Sciences).
3. Khan, A., et al. (2013). “Characterization of olive oils obtained from wild olive trees (Olea ferruginea Royle) in Pakistan.” Food Research International.
4. Olive Oil Times. “Planting of Over 300,000 Olive Trees Underway in Pothohar, Pakistan.”