How Tree Plantions Are Reshaping Groundwater in Our Catchments

For decades, researchers across the Murray-Darling Basin have watched tree cover thin out alongside falling bores and stressed paddocks. The story is familiar in the bush: clear a hillside, watch the spring dry up, then wonder why the creek stops flowing by mid-summer. Replanting native species has long been floated as a fix, but the link between canopy recovery and underground water reserves is more nuanced than old wisdom suggests.

Fresh Del Monte's reforestation work, carried out across tropical and subtropical production landscapes, sits within a much wider conversation. When growers, scientists and community groups talk about regenerating forest cover, the conversation usually turns to carbon, biodiversity and shade. Groundwater tends to come later, if at all. Yet the data emerging from monitored sites tells a quieter, more compelling story about what happens to subsurface moisture when trees go back into the ground.

This piece looks at how planting activity along production boundaries and in restoration zones is being measured against bore levels and aquifer recharge. It also explores why these findings matter to Australians, where seasonal dryness and river-system health are part of everyday life, and what the broader sustainability picture looks like when water is treated as a leading indicator rather than a footnote.

The aim here is not to oversell a single intervention. Forest restoration interacts with climate, soil type, tree age and surrounding land use. But when the numbers are tracked properly, the pattern becomes hard to ignore.

The connection between forests and aquifer behaviour

Trees do more than catch rain on their leaves. Their roots open channels through compacted soil, their leaf litter slows runoff, and their shade lowers ground temperatures so moisture evaporates more slowly. Together, those processes allow more rainfall to soak into the earth rather than slide off bare ground into swollen creeks.

Scientists refer to this as infiltration and deep percolation. Farmers notice it when stock dams hold water longer through a dry stretch. Either way, the principle is straightforward: healthy forest cover gives rain more time and more pathways to reach the water table below.

The catch is that mature forests also drink a lot of water. Eucalypts and other deep-rooted natives can pull moisture from metres below the surface, particularly during hot spells. So restoration is a balance, not a one-way lever.

Our reforestation approach in practice

Fresh Del Monte's planting projects focus on three layers: riparian strips along waterways, windbreaks on production edges, and larger regeneration plots on land that is no longer productive for cropping. Species selection is matched to local conditions, which often means native hardwoods, fruit-bearing trees where appropriate, and cover crops in the spaces between.

In our sustainability progress reporting, the company tracks hectares planted, survival rates and the share of native versus introduced species. Sites are revisited at set intervals to check canopy density, soil organic matter and, importantly, groundwater monitors installed in partnership with local hydrologists.

The approach is deliberately patient. A five-year-old plantation barely registers in recharge figures. A fifteen-year stand begins to change the conversation. Reporting reflects that longer horizon rather than chasing short-term wins.

Measuring what matters below the surface

Groundwater monitoring is unglamorous work. Teams install piezometers in clusters, take readings by hand or with data loggers, and check them against rainfall records and river flow gauges. Over time, those readings build a picture of how levels respond to different interventions on the surface.

The signal emerging from these plots is consistent: where native cover has been restored and protected land monitored long-term, aquifer levels hold steadier through dry periods than in comparable cleared paddocks. The uplift is modest in absolute terms, often a few centimetres across a season, but in farming country those centimetres can be the difference between a functioning bore and a struggling one.

Independent verification matters here. Where data has been cross-checked against regional hydrogeological surveys, the trends line up. That gives growers, neighbours and regulators something to work with rather than a hopeful anecdote.

What this means down under for farms and communities

Australian growers know what a falling water table looks like because many have lived through it. The Great Artesian Basin, the Murray-Darling system and countless smaller catchments have all seen periods where bores needed to be deepened, pumps replaced and allocations trimmed. In regional communities from southern Queensland through the Riverina and into western Victoria, groundwater is not an abstract resource. It is the difference between a viable harvest and a sold-off herd.

When restoration planting is treated as part of a catchment plan rather than a stand-alone project, the picture sharpens. Native vegetation buffers help slow the kind of runoff that ends up scouring creek beds after a sudden downpour. The same roots that pull up moisture also bind soil, so less sediment ends up in rivers like the Murray or the Murrumbidgee. Paddocks downstream benefit from steadier flow, and townships that rely on bore-fed reserves find their taps a little more reliable.

Locals will tell you, often over a flat white at the servo or with a nod across the boundary fence, that tree planting is rarely the whole answer. Paired with good land management, riparian fencing and updated irrigation tech, it pulls its weight.

Working alongside local stewardship groups

Community-driven conservation has deep roots in this country. Landcare groups, going back to the late 1980s, showed what neighbours could achieve when they pulled together on degraded ground. That culture of mateship and practical doing still shapes how revegetation projects are rolled out in many districts.

Fresh Del Monte's field teams partner with regional councils, indigenous land managers and catchment bodies to align planting with local priorities. In some areas, that means focusing on salinity reduction. In others, it is about stabilising eroded gullies or re-establishing habitat for native pollinators that support fruit and vegetable yields.

Genuine partnership means sharing monitoring data openly and letting local knowledge shape which blocks get planted first. Arvo inspections with long-time landholders have, in more than one case, redirected resources toward sites where community benefit is highest.

Linking soil moisture to broader land health

Recharge is one half of the water story. Discharge matters just as much. Mature trees transpire moisture, evaporation claims its share, and some of that water travels long distances before it falls again. The goal is not to maximise infiltration at the expense of everything else, but to find a balance that supports both production and natural systems.

This thinking ties directly into the firm's wider sustainability framework, including the watershed awareness program that supports education and habitat work in key catchments. When soil moisture, biodiversity and productive yield start moving in the same direction, the case for sustained investment gets clearer.

It also reframes how a global produce business can act locally. A plantation on a far ridge may seem small on a balance sheet, but on the ground it can steady a water source that matters to a whole district.

Practical steps for different stakeholders

• Growers considering tree planting should map existing bores and aquifers before site selection, then revisit readings at the same season each year.
• Catchment groups can coordinate planting priorities across neighbouring properties to maximise infiltration across a whole valley.
• Companies sourcing tropical fruit and vegetables benefit from asking suppliers about long-term land monitoring, not just short-term yield figures.
• Local councils reviewing land-use plans can give weight to restoration projects that include verified groundwater data.
• Researchers gain value from open datasets, so sharing bore logs and rainfall records builds a clearer regional picture.
• Consumers can support producers who publish multi-year sustainability results rather than only annual highlights.

The clearest lesson coming out of these projects is that what happens below the surface responds to what is planted on top. Restoration done well and measured honestly lifts groundwater, stabilises surrounding land and gives communities one less thing to worry about when the rain doesn't come. That quiet, unglamorous work deserves just as much attention as the headline hectares planted.