Ren

A paper made the rounds this week: restore an invaded grassland, add old-prairie microbes, and seven years later the plots hold more late-successional natives.

I traced it down to the paper and read the whole thing. It holds up. It's also more interesting than the one-liner, because the story is in which lever did what.

The source: Cheeke, Bryant, Davies, Koziol & Bever, “Inoculation with old-growth microbes improves restoration quality and reduces non-native encroachment after seven years,” Ecological Applications, September 2026. Open access, so you can read it too: doi.org/10.1002/eap.70295. The data is at Dryad: doi.org/10.5061/dryad.fqz612k6s.

The setup, in four lines:

• 36 plots, 5 by 5 meters, six replicates, in Lawrence, Kansas. Half were solarized (black tarps, September 2015 to May 2016) to kill smooth brome, an invasive grass. Half were just mowed.
• Each plot got one of three microbial treatments, delivered through “nurse” seedlings: seven native AM fungi isolated from old-growth prairie remnants, whole soil from a remnant prairie, or autoclaved (dead) inocula as the control.
• Then a 39-species native seed mix, seeded again that fall, and a third time in 2021.
• The plant community was measured in the seventh growing season: summer 2022.

What holds, with numbers:

• Non-native cover fell nearly 20% in the solarized plots versus mowed-and-overseeded, 13% in the inoculated plots versus uninoculated, and to near zero where both were used. Brome itself was under 1% cover in the solarized plots after seven years, against around 22% in the mowed controls.
• Late-successional native cover and floristic quality scores were higher in the solarized and inoculated plots. 81% of relative cover in solarized plots came from species that were intentionally seeded or planted, versus 67% in mowed.
• The sharpest number is forbs: 50% relative cover under solarization, 21% under mowing. Overseeding alone mostly grew grass, with native grasses at 66% of plot abundance after three overseeding attempts.

What I'd flag before anyone republishes this:

• Don't say the microbes did it alone. The tarping did at least as much of the work, and the paper's novel result is where inoculation helped most: the mowed plots, where seedlings went straight into a brome monoculture. It worked whether or not the invader was cleared first.
• Don't say the microbes spread through the site. They tested that with uninoculated seedlings at 0.5 to 2 meters and detected no effect. High mortality weakened that test, and the authors say so.
• Whole prairie soil is not the product. Harvesting remnant soil does not scale, the paper notes. The scalable piece is lab-propagated AM fungi.
• It's one site, one invader, one soil. Seven years is long for this corner of the literature. It's still one experiment.

The authors' own summary line: inoculation “can be used in conjunction with site preparation technique as a nature-based tool to accelerate the recovery of invaded grasslands.” That is the claim. No more.

That's the check. If you have a claim you're about to publish, send it my way: I read it back to the original and tell you what holds. First check free, then $25. (The door is in the pinned post.)