Restoration in a Changed World

Why Function Matters More Than the Past

“Native plant restoration is not archaeology. We are not rebuilding the past, we are rebuilding functioning ecosystems for the world we live in now.”

When we talk about restoring native plants, we often imagine a landscape frozen in time. Many people aim for a precise snapshot of what existed before European colonization. The assumption is that if we could just find the correct historical plant list and put everything back, the ecosystem would heal itself.

That assumption no longer holds. The ship has sailed on recreating the past.

When we talk about plants, we are talking about the entire community. This includes trees, shrubs, vines, grasses, sedges, rushes, and forbs. Today, we are not working on an untouched canvas. We are working inside systems that have been fundamentally altered at local, regional, and global levels.

The goal of modern restoration cannot be perfect historical reconstruction. It must be the rebuilding of functional ecosystems that support life now and into the future.

How the Landscape Was Reengineered

Using the Midwest as an example, the reality of these changes becomes clear. Since European colonization, humans have altered nearly every ecological driver that shaped the land. This was not a gentle degradation. It was a total reengineering of entire systems.

• System Conversion: Tallgrass prairies and oak savannas were converted to industrial agriculture or developed into urban centers.
• The Loss of Fire: Fire suppression fundamentally changed the structure of the land. Systems that evolved with frequent, low intensity fire shifted toward dense, shaded thickets. Oak and pine regeneration declined while shade tolerant species expanded. This reduced the productivity of the entire food web.
• Invasive Species Saturation: The introduction of aggressive, non native species has fundamentally altered landscape biology. Plants like common buckthorn, garlic mustard, and reed canary grass do not just occupy space. They actively reengineer the environment. They change soil chemistry, shade out native regeneration, and break the relationships between plants and the insects that rely on them.
• Hydrological Alteration: Wetlands were drained, ditched, and filled. Rivers were straightened and disconnected from their floodplains. With the installation of drainage tiles, water tables dropped and runoff increased.
• Soil Destruction: Soils were plowed, compacted, and eroded. Fungal networks were broken. In many places, the soil that remains is not the soil that originally formed there.
• Trophic Collapse: Large predators and keystone species like bison were removed. This created an imbalance where deer populations, lacking natural checks, exert massive browsing pressure that prevents forest regeneration.

Global Pressures on Local Land

Even if we stopped all local development today, the playing field has changed forever. Global factors now layer on top of local damage.

Atmospheric CO2 concentrations are far higher than pre-industrial levels. This changes how plants grow and how they compete for resources. Nitrogen deposition from industry and agriculture has altered soil fertility across entire regions, often favoring fast growing invasive species.

The climate has shifted. Seasons arrive at different times. Heat waves are more frequent and precipitation is less predictable. Species now move faster than ever, assisted by global trade. No historical plant list was ever assembled under this specific combination of pressures.

The Limits of Historical Maps

We often treat native plant ranges as if they are static and perfectly documented. They are not. Most historical records are incomplete snapshots filtered through the eyes of early colonial botanists.

Wildlife does not follow these maps. Birds migrate thousands of miles. Pollinators track bloom timing rather than county lines. Insects and mammals respond to cover, food, and structure. They do not care about floristic purity.

Restoration succeeds or fails based on function, not paperwork. A landscape that provides a robust food web and nesting habitat is a success, even if its plant list is not a perfect mirror of the year 1800.

Museums vs. Recovery Projects

There is a vital distinction between a remnant and a restoration site.

Remnant ecosystems are ecological museums. They are the few remaining places that haven't been plowed or paved. They deserve the highest level of protection. They should be managed conservatively to protect their unique genetic lineages.

Most restoration sites are former lawns, crop fields, or degraded woodlands. Applying museum level rules to these sites often prevents meaningful recovery. In many cases, there is no intact local gene pool left to protect.

The Reality of Genetic Risk

A common objection to flexible plant sourcing is the fear of genetic harm. People worry that moving plants across regions will hurt local populations.

While these concepts are real in a laboratory setting, there is very little landscape scale evidence showing that responsible movement causes long term harm in degraded systems. The biggest genetic risk today is not movement. It is isolation.

Small, fragmented populations suffer from inbreeding and a lack of adaptive potential. Preventing genetic exchange in the name of purity can actually accelerate the decline of a species. We have overwhelming evidence of insect collapse and bird population declines. We do not have comparable evidence of ecosystem collapse caused by moving native plants within their ecoregions.

Ecoregions as a Compass

If historical maps are unreliable, we need a better tool. EPA Level III ecoregions represent a practical sweet spot. These regions capture patterns in climate, geology, and soil. They reflect how landscapes actually function.

A practical framework for the "All Hands on Deck" era looks like this:

1. Start with the primary ecoregion where the site is located.
2. Include adjacent ecoregions when the environmental conditions align.
3. Prioritize site conditions like soil texture, moisture, and light.
4. Focus on wildlife needs by selecting plants that support specific host relationships and bloom sequences.

Restoration is Not Archaeology

We are not operating in a stable system. Habitat loss and species crashes are happening now. Waiting for perfect historical certainty while ecosystems unravel is not responsible stewardship.

The relevant question is not what did this place look like 300 years ago. The relevant question is what does this place need to support life today and tomorrow.

Native plants remain the foundation. Ecoregions still matter. But restoration must prioritize soil recovery, food web support, and resilience. Flexibility grounded in ecological literacy is not recklessness. It is realism. Restoration is about our responsibility to the future, not our obsession with the past.

Supporting Evidence & Fact Check

Novel Ecosystems: The concept that historical baselines are often unattainable due to irreversible abiotic or biotic changes is a foundational principle of modern ecology (Hobbs et al. 2013).

Soil Reengineering: Research confirms that invasive species like buckthorn fundamentally alter nitrogen cycling and leaf litter decomposition, creating a feedback loop that disadvantages native plants (Heneghan et al. 2006).

Genetic Isolation: Contemporary conservation genetics indicates that for many fragmented populations, inbreeding depression is a more immediate threat than outbreeding depression from regional plant movement (Whiteley et al. 2015).