Casualties of the oil business
The old olive grove was one of Europe’s richest half-wild habitats: orchids, wild tulips and insects thriving in the stony ground beneath ancient trees. Push those trees to produce harder, and that quiet abundance is the first thing to go.
For centuries the Mediterranean olive grove was not just a place that made oil; it was one of the richest man-made habitats in Europe. Widely spaced old trees, thin stony soil and light grazing left room for an astonishing understorey — wild tulips, gladioli, several kinds of orchid, and the insects and birds that lived among them. Spring in an old grove could look, as one writer put it, like coloured confetti scattered across the ground. That world is quietly disappearing, and the cause is not neglect but its opposite: intensification, the drive to make every tree yield more.
How intensification erases the understorey
The mechanism is simple and unglamorous. To lift yields, growers feed old trees with nitrogen fertiliser and clear the competition beneath them with herbicide or repeated tillage. But the flora of the traditional grove is adapted to poor, low-nitrogen soil; enrich the ground and coarse grasses take over, smothering the delicate specialists that cannot compete. Add herbicides, and the wildflowers vanish outright. The tell-tale sign is a grove floor gone lush and uniform green — the exact colour, as sharp-eyed visitors notice, that only heavy feeding produces. The oil may flow, but the confetti is gone.
Subsidy, scale and the super-intensive shift
None of this happens in a vacuum. For decades, agricultural support was tied to production, effectively paying growers to push output — and more recently the industry has moved towards super-intensive hedgerow plantings, dense rows of young trees farmed like a vineyard and machine-harvested. These systems are efficient and productive, but they are close to sterile at ground level, a world away from the biodiverse old grove. The result is a landscape that still grows olives but no longer supports the web of life that used to come free with them.
Can the two be reconciled?
Partly, and it is worth being honest about the trade-offs rather than romantic. Traditional low-input groves are less productive and harder to farm, which is exactly why they are vanishing; a grower cannot live on orchids. But there are middle paths — cover crops instead of bare, sprayed earth; grazing instead of herbicide; keeping veteran trees rather than grubbing them out. As a buyer, you have a small lever too: oils from traditional, organic or high-nature-value groves cost more precisely because that biodiversity has a price, and paying it is the only thing that keeps some of these old landscapes alive.
| Traditional grove | Intensive / super-intensive | |
|---|---|---|
| Tree spacing | Wide, old trees | Dense hedgerows, young trees |
| Ground beneath | Wildflowers, orchids, insects | Cleared, sprayed or tilled |
| Inputs | Low; poor soil suits the flora | High nitrogen, herbicide |
| Yield | Lower, variable | High, uniform |
| Biodiversity | Rich | Sparse to near-sterile |
- A lush, uniform green grove floor is a sign of heavy feeding, not health.
- Old, widely spaced trees with a flowery understorey are the biodiverse ideal.
- Cover crops and grazing beat bare, herbicided earth for wildlife.
- Buying traditional, organic or high-nature-value oil helps pay for biodiversity.
- Accept that traditional groves are less productive — that is why the price is higher.
Olive groves and biodiversity: common questions
Why are wildflowers disappearing from olive groves?
Intensive farming feeds trees with nitrogen and clears the ground with herbicide or tillage. The grove’s delicate wild plants are adapted to poor soil and cannot survive enrichment and spraying.
Are old olive groves good for wildlife?
Yes — traditional, widely spaced groves on poor soil are among Europe’s richest man-made habitats, home to orchids, wild bulbs, insects and birds.
What is super-intensive olive farming?
Dense hedgerow plantings of young trees farmed like a vineyard and machine-harvested. It is highly productive but supports very little life at ground level.
Does buying certain oil help?
It can. Oils from traditional, organic or high-nature-value groves cost more because that biodiversity is expensive to keep, and paying for it helps these landscapes survive.
Is intensive farming simply bad?
Not simply — it is efficient and keeps oil affordable. The honest point is that low prices have an ecological cost, and the old, flowery grove is part of what is being traded away.
People assume the threat to the old olive grove is neglect. It is the opposite: it is being farmed harder. Feed a veteran tree nitrogen and spray the ground clear and you will get more oil and lose the orchids, the tulips, the insects — all in one season. I am not romantic about it; traditional groves are hard to make pay, and that is why they are going. But when you buy the cheapest bottle, you are voting for the sterile hedgerow. Pay a little more for traditional or organic oil and you are helping keep a living landscape, not just a crop.
Drawn from Mediterranean grove ecology, agricultural intensification and the shift to super-intensive plantings.