Why Biodiversity Matters in a Modern Vineyard, and What We're Doing About It

FROM THE VINEYARD

A vineyard is never just vines

A vineyard is never just vines. It is soil, slope, wind, insects and roots: an ecosystem held together by things most people never see. At Quinta do Hossio, on the southern slopes of Serra d’Ossa, we are learning to work with that system rather than against it.

This year, we planted new gardens around the house and along the stone walls. Not simply for decoration. To bring more life into the wider vineyard, and to give insects and birds somewhere to feed and shelter.

What we planted, and why

Every species was chosen for two reasons: to attract pollinators and to survive on very little water.

Lavender, rosemary, thyme, oregano, sage and santolina are aromatic herbs that can thrive in the Alentejo heat and provide flowers for bees through much of the growing season. Cistus, the wild rockrose native to Serra d’Ossa, was planted alongside aroeira, medronheiro and pilriteiro: shrubs whose flowers and berries can support insects and birds at different times of year. Gaura and verbena extend the flowering window into months when little else blooms.

We also started a small orchard. Pomegranates, plums and peaches are already in the ground, alongside lemon and orange trees. Carob, persimmon and almonds will follow. Some will bear fruit we can use. All of them will feed something.

The principle is simple. When vines are the only plants given room to grow, the wider habitat becomes poorer. Pollinators have fewer flowers to visit. Predatory insects that help control vine pests have fewer places to live. Bare ground is more exposed to erosion and compaction. The grower becomes more reliant on interventions that a more diverse ecosystem can help reduce.

We would rather plant a garden.

Water as a constraint, not a resource

Alentejo summers are brutal. Temperatures can exceed 40°C. Rainfall between June and September is often close to zero. Any planting that demands heavy irrigation would be working against the place, not with it.

Every species in the new beds was selected for drought tolerance. Irrigation uses low-pressure drip lines with pressure-compensating emitters, delivering water directly to the root zone rather than spraying it into the air or across the surface. A Wi-Fi-connected controller schedules watering at night, when temperatures are lower and less water is lost to evaporation.

We are not eliminating irrigation. We are minimising it: choosing plants that need less, then delivering what they do need with care.

We have written about the wider approach, from the restored Nora to soil-moisture monitoring, in What the Serra Gives Us: Water, Wine and Serra d’Ossa.

The longer view

Biodiversity is not a marketing position. It is a practical decision about what kind of estate we want to build over the next twenty years.

Healthy soil gives vines a better foundation. Diverse planting attracts the insects that pollinate flowers and help keep some vine pests in check. Established shrubs and their roots can help hold topsoil in place on slopes where winter rain might otherwise wash it away.

Serra d’Ossa is already rich in biodiversity: cork oak woodland, wild herbs, migratory birds and a landscape that existed long before anyone planted a vine here. Our job is not to improve on that. It is to make sure our presence does not diminish it.

The gardens are planted. The first lavender is already flowering. We will not know the full effect for several seasons yet.

That is the point. Some things worth doing take time to show.