Long ago, we wrenched grapevines from their natural habitat. Enthusiastic creepers, their shoots and tendrils are designed to cling onto whatever they can as they grow; winding themselves around trees or other plants in the wild. But we dragged vines out of the forest and forced them into rigid trellises, taming their wayward growth to produce a crop that served our purpose. Now, however, there’s a movement to re-integrate trees and plants into viticulture.
Cheval Blanc is one of the most famous proponents of agroforestry, which is a key part of its manifesto on a modern approach to viticulture. Augustin Fromageot – who now works full time at Anjou’s Domaine Belargus – was one of the team involved in the project, planting over 4,000 trees at the estate in two years. Until then, Fromageot – a trained geologist – had been working in South America, largely in cocoa and coffee, but the vine was calling. The team converted the estate into a laboratory of sorts – experimenting with different ways to integrate trees, within rows, replacing rows, in copses and borders or any other way you can imagine planting them alongside vines, all set to be followed in scientific programmes to track what works and what doesn’t. Now he’s doing a similar thing at Belargus, managing their extensive nature reserve and working to increase biodiversity on the estate – working to manage the landscape, as he sees it.
It’s an oversimplification to suggest that vines have gone directly from wild creepers to industrialised monocultures. Historically, farming was poly-cultural, a smallholding contained everything a family needed – and vines often formed part of that. Pergola trellising, for example, allowed for other crops to be planted beneath, while trees being used as a living trellis was not uncommon – often referenced as married vines, the Roman method of arbusta (favoured by Pliny, for example) – and grown alongside each other, culture en hautain, cultura mista or joualle. It’s this latter method, favoured in southwest France a century or so ago, that Cheval Blanc has in part been trialling, with individual trees replacing vines within a row. It looks beautiful, however brings its own complications, limiting mechanisation. It is, as Fromageot, says, a “poetic” way to integrate trees. You’ll still find vines trained up trees in Bolivia, in the Cinti Valley (as for the Jardín Oculto project), although these are ancient examples – and few would plant vines like this today. It’s an impractical way to farm, at the end of the day, one that only worked on a very small scale, but it’s clear that industrialisation has pushed monocultures too far – and agroforestry is one way in which producers are trying to fix the damage done.
Trees are remarkable in many ways, but they can have a huge impact on a vineyard. Their physical presence can influence the microclimate – protecting a vineyard from frost, heat and wind, as well as acting as a physical barrier between neighbouring properties – preventing any unwanted sprays drifting into your vines. They increase biodiversity – providing a habitat for insects and animals, in particular bats, and they absorb carbon dioxide. They reduce soil erosion (with topsoil erosion a major threat to agriculture worldwide) and increase organic matter, which in turn increases soil’s water-holding capacity – a major plus in dry regions. For Fromageot, trees help to create a resilience in the vineyard, reinforcing the vines’ natural defences, and therefore reducing the number of treatments required.
It’s easy to look at such a list and understand the principles at play. Clearly there are benefits for the environment – but what does it mean for the wine in your glass? Well, a lot, potentially. As few as five trees will influence the microclimate in a 100-metre radius; they can reduce the temperature in a parcel by as much as 2-3°C, preserving acidity, lowering alcohol and retaining precision in the aromatics. And, shielding a vineyard from extreme frost or heat, as well as providing better water reserves in the soils, allows for a more consistent yield, all of which is beneficial with climate change – with both more extreme weather conditions and global warming.
Of course, it’s not quite as simple as it sounds. “It teaches us an immense humility,” Fromageot tells me, as I start asking him about the world of agroforestry, and more specifically vitiforestry. He’s more than aware that agroforestry has become a buzzword in wine – it's suddenly very trendy. But there’s a lot of work involved in planting and managing trees. For starters, deciding where and how to plant trees is key. Their ability to influence microclimate can be both good and bad – with the potential to create frost pockets, to increase humidity, reduce airflow and therefore disease pressure. “You need to read the landscape,” Fromageot explains.
You also have to decide what sort of tree to plant, as well as the rootstock, ensuring it will complement viticulture. The first thing Fromageot does when taking on a project is look at all the local nurseries to understand the native varieties. Fruit trees are common, but as he notes, you need to ensure it has a different harvest time to grapes to avoid any conflict – he looks to apples, pears and prunes, in particular, highlighting how challenging peaches and apricots can be. Otherwise, the likes of maple, ash, mulberry, black poplar, hornbeam and linden can all work – essentially trees that share the same type of mycorrhizae (the microorganisms that attach to roots) as vines. You want to avoid anything that might taint your wine, or anything that will inhibit growth – such as walnut trees, which produce a toxic compound, juglone.
Trees have significantly different requirements to vines, needing different equipment and expertise to thrive, with – for example – extensive fertilisation to establish trees, which need richer soils. Trees will – wherever they are planted – occupy space that could otherwise be used for vines, yielding additional crop. And it’s a slow process, with it taking around a decade for trees to start influencing viticulture in a meaningful way, says Fromageot. All of this costs time and money – making agroforestry a luxury that not all producers can afford, although Fromageot feels that trees can be integrated in a different way for producers working at scale.
Alain Canet – an agronomist and specialist in agroforestry – argues that re-introducing trees is crucial for agriculture. “For some soils it is already too late,” he writes. “But for most, we have time to act... In agroecological terms, the transition to trees is the transition to life.” There are many scientific reasons to favour vitiforestry, but for Fromageot there is a more compelling reason: the landscape fixes people to a geography, to a place, and that – he argues – is essential for making fine wine. Beauty in the landscape you live and work in helps us “find sense in life”, he tells me. Romantic? Maybe. But with the science to back it up, it’s hard not to be persuaded that trees line the way to a more sustainable future – in wine, yes, but in wider agriculture too.
