A rare desert plant in Nevada, called threecorner milkvetch, increased from just 12 known plants to 93 after a large solar power project was built nearby.
Rather than clearing everything away, the project was designed in a way that allowed the plant not only to survive, but to grow in greater numbers than before.
At the Gemini Solar Project near Las Vegas in the Mojave Desert, surveys tracked threecorner milkvetch, a small, low-growing desert wildflower in the pea family, before construction and again later. 
Using those maps, ecologist Tiffany J. Pereira at the Desert Research Institute (DRI) traced the increase across panel rows.
Pereira’s paper reported 12 threecorner milkvetch plants before construction, then 93 after the facility started running in 2024.
That rise came from an approach that left soil and seeds intact, not from adding irrigation or moving plants in.
Low to the ground, threecorner milkvetch rarely shows itself unless winter rains arrive at the right time.
Botanists list it as Astragalus geyeri var. triquetrus, and a seed bank, stored seeds resting in soil for future growth, keeps it alive.
Nevada lists the plant as Critically Endangered and Fully Protected, so any ground disturbance can wipe out a whole patch.
That fragile life cycle makes the Gemini counts more than a curiosity, because it shows a project can avoid crushing a rare species.
Under the panels, moving shade lowered ground temperatures and slowed the pace of evaporation after each rain.
That extra dampness created a microclimate, a small pocket with different temperature and moisture, across much of the array.
Wind and sun hit harder outside the fence, so nearby plants lost water faster and stayed smaller.
Too much shade can also reduce growth, which explains why plants rarely popped up under the darkest parts.
During the 2024 search, technicians found most plants in the open lanes between rows of panels.
Those lanes got partial shade and extra runoff, so seedlings kept enough light while soil stayed damp longer.
“Ninety-four percent of the threecorner milkvetch plants found at Gemini grew in the interspaces between panels,” wrote Pereira.
If future surveys keep seeing that pattern, designers may need higher panels or wider gaps to protect habitat.
Inside the solar footprint, plants grew taller and wider, and each one carried far more flowers and fruits.
Extra moisture let stems keep stretching through spring, which gave blossoms more time to turn into seed pods.
Tagged plants from the DRI team began fruiting nearly 3 weeks earlier and produced eight times more flowers and ten times more fruits.
“Survivorship between the two populations, however, was not significantly different,” wrote Pereira after comparing tagged plants on and off-site.
The flood of new fruits only matters if seeds survive heat, time, and hungry animals until rains return.
Lab work showed 100% seed viability and confirmed physical dormancy, a hard coat that blocks water until scratched.
Once technicians nicked the coat, seeds soaked up water fast, which matches a desert strategy of waiting for rare storms.
With viable seed still in the soil, one wet spring can restock future years even when adult plants die.
Before any panel rises, crews usually decide whether to keep the desert surface intact or level it.
Many developers still use blade and grade, a method that clears plants and levels ground, because it feels predictable.
Gemini chose lighter-touch routes and limited grading, so equipment moved around vegetation instead of scraping everything away.
That lighter touch left natural drainage paths working, which matters when stormwater runs hard across a desert job site.
Across renewable energy, ecovoltaics, building solar sites to support native habitat, treats vegetation as part of the project.
On the ground, living cover cools soil and holds it in place, which can curb dust and slow erosion.
More plants also feed soil microbes and store more carbon belowground, while flowers give pollinators food inside fences.
Keeping habitat in working order does not erase land use, but it can stop a solar site from becoming dead ground.
One good year can flatter any desert project, because rain decides when hidden seeds wake up and grow.
Pereira and the DRI team tracked plants for a single growing season, and the 2024 survey covered far less land than 2018.
Long-term monitoring needs to watch dry years and deep shade zones, where low emergence could shrink usable habitat.
A federal study projected solar could supply 40% of U.S. electricity by 2035, raising the stakes for smart siting.
Gemini’s milkvetch boom shows that solar panels can add energy without always stripping life, when builders respect soil and timing.
Future projects can borrow that approach, but they will need long records across wet and dry years to prove it lasts.
The study is published in Frontiers in Ecology and Evolution.
Photo: Tiffany Pereira
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