A failed attempt to restore California’s grassland costs $225,000 per acre

Native Americans had no domesticated animals when Europeans arrived in the late 15th century.  When Europeans brought cattle and sheep to the New World, they brought the Mediterranean grasses that fed their herds with them, often unintentionally.  These non-native grasses spread quickly.

By the time Europeans arrived in California in the late 18th century, several European plants had spread from Mexico where Mediterranean grasses already dominated.  In the mid-19th century, an influx of gold miners increased demand for beef.  Grazing of the native bunch grasses created an opportunity for the non-native annual grasses to occupy the disturbed ground.(1)  California’s native bunch grasses are not adapted to heavy grazing by herds of domesticated animals.  The grassland of California is now about 98% non-native.(2)

Restoring California’s Grasslands

Because so much of California was grassland when Europeans arrived, the restoration of grassland is a high priority for native plant advocates.  This is the story of one attempt to restore native grassland in the Sacramento Valley.  The project was funded by UC Davis and Caltrans, the State of California’s transportation department.

First seeding of test plot, February 2003. ecoseed.com

Project Time-Line

  • February 2003:  2-acres drill-seeded with native grasses
  • June 2003:           First-year planting declared a failure.  Site was sprayed in May.
  • October 2003:    Site is burned and re-seeded.
  • January 2004:     Exotic grasses have been managed
    • Bare soil and seedlings of broadleaf weeds remain
  • May 2004:`          About 1,000 plants of native grass remain
  • August 2004:      Yellow star thistle is mowed
  • Nov 2005:            A total of only four native grass plants appear to have survived
  • Spring 2006:        Plot is plowed and replanted by drill-seeding
  • Sept 2006:           4% native grass underneath non-native weed canopy
  • August 2008:      Yellow star thistle and wild oats are invading from the edges.
    • Native grasses expected to persist from 2 to 10 years depending on rainfall
  • Autumn 2009:    Fifth planting attempt produced only about 30% coverage
  • August 2011:       Natives and non-natives about 50/50
  • January 2012:     27% natives and 72% non-natives
Dunnigan Test Plot, Augusst 2011.  The result of an eight-year effort to restore native grassland.  Does it look "biodiverse?"  ecoseed.com.
Dunnigan Test Plot, Augusst 2011. The result of an eight-year effort to restore native grassland. Does it look “biodiverse?” ecoseed.com.

 Failure at what cost?

After many years of replanting, reseeding, mowing, burning, plowing, and spraying, the 2-acre site is still dominated by non-native species and those natives which survived are not expected to persist for more than 10 years as they are overtaken by the non-natives.  Using state-of-the-art-techniques and the expertise of one of the most prestigious agricultural research institutions in the world, this project must be considered a failure.  The price of this failed effort was $225,000 per acre. 

[Edited to Add:  We discovered two new sources of information (3) on this topic after publishing this article.  These sources inform us that the cost estimate in our original source is based on a research grant which probably included costs associated with the research, such as data gathering and analysis.  Therefore, the price of this effort overestimates the cost of the restoration itself.  Although the new sources of information provide cost estimates of grassland restoration, we don’t consider those estimates substantially more accurate because they report only the direct cost of the project and predict a shorter time frame for the restoration than the actual project which took 5 years.]

They did the best they knew how to do.  They were only trying to restore 2-acres.  They spent nearly $500,000.  And what do they have to show for it?  A few native plants that will disappear in 10 years or less.

[Edited to Add:  The new sources of information also reach different conclusions with respect to the success of these restorations.  Although the specific test plot described in our original source is not included in the study, many similar projects are considered successful by the new source of information.  This seems to be a question of “glass-half-empty” vs “glass-half-full.”  The reported results are similar in both publications, i.e., non-natives persist in all test plots and natives are not expected to persist beyond 10 years.

 However, the positive evaluation is based on a claim that the maintenance of non-native grasses is more costly than  these restoration efforts.  We find that hard to believe.  For example, we don’t see any reason to spray herbicides on non-natives being maintained in a highway verge which is the standard treatment for the restoration of natives.  We know that the cost of each application of herbicides on much smaller plots of land in the natural areas in San Francisco was $9,000 per application in 2010.  We therefore doubt that it costs more to maintain non-native grassland than it does to restore native grasses in their place.] 

San Franciscans who have been watching the so-called “natural areas” in San Francisco for 15 years should not be surprised or disappointed by these weed-infested plots behind fences.  Why should the Natural Areas Program be more successful than the scientists at UC Davis?  Given that NAP is working on tiny plots of urban land–which add up to 1,100 acres–that are completely surrounded by exotic plants, shouldn’t we expect even less success than what UC Davis could accomplish in the Sacramento Valley surrounded by acres of open space?  Lower your expectations, San Francisco.  Or refuse to waste your tax dollars on plowing the sea.

(1) Crosby, Alfred, Ecological Imperialism, Cambridge University Press, 2009, page 152-154

(2) Schoenherr, Allan, A Natural History of California, UC Press, 1992

(3) Stromberg, Mark, et. al., California Grassland Restoration,

O’Dell, Ryan, et. al., Native perennial grassland persist a decade after planting in the Sacramento Valley

Update May 30, 2021:

I received this email today from the cited author and photographer who is quoted in this post.  My original article included the source of the photos as well as a link to his website.  MilllionTrees 

At https://milliontrees.me/2012/01/03/a-failed-attempt-to-restore-californias-grassland-costs-225000-per-acre/ you have “borrowed” my photos and research without permission, and did not even cite me as the source.  And did not have the URL for my data, so others could see more of the details?
Also, you should read the original proposal for that project, that is at https://www.ecoseeds.com/grant.html –this is much more important information that the cost of 2 acres costing 1/2 million–What you read in that document, is that anyone at UC Davis was capable to do all of the inventing that was promised in that proposal?
We need to add some items to that page to at least give me credit for all of that work photographing and monitoring that project, and just putting a “ecoseeds” next to the picture does not do the job?
Meanwhile, while everyone was floundering, I have restored 800 acres of grasslands so far in California, and “restored” means 95% or better native cover.  My current project is unearthing 100-250 year old dormant native seeds, that exist in the soil underneath the weeds, and get it back to 90-95% native in only 3-4 years–no need to seed if they are still in the soil.   First project like that was the 70 acres at 300 Byers Lane, La Selva Beach where we went from 99% weed-covered to 95% native across the whole property, that you can read about at https://www.ecoseeds.com/shaw.pdf
============== I tried to post this to your site, but it did not take it>>>>
Just as a NOTE here, the photos and data, even though it is not cited,  is from my annual monitoring of this project at https://www.ecoseeds.com/road.test.html and even more interesting is the grant proposal that is at https://www.ecoseeds.com/grant.html
Meanwhile—at the same time that the State of California and others were spending millions on failed California grassland projects–I have restored 800 acres of California grasslands so far, and “restored” means 95% or better native cover.  And after the discovery at the 70 acre Shaw property in 1992-2000 at 300 Byers Lane in La Selva Beach, of dormant native seeds in the soil underneath the weeds, there is probably no need to sow native seeds in any California grassland restoration projects?  We went from 99% weed cover to 95% native cover, by unearthing the dormant 100-250 year old native seeds still in the soil, that sprouted at the rate of 5-10 seedling per square inch.  And over 100 species of natives sprouted, including two that were new to science. You can see the list of natives that sprouted and the list of weeds eradicated at https://www.ecoseeds.com/shawlist.html
And please correct David Amme’s mis-spelling of my name?
Sincerely,  Craig Dremann CELL (650) 441-9323

Update #2 May 30, 2021
I am posting the second email I received today from Mr. Dremann.  The information he has asked me to add to the post did not exist at the time it was published in January 2012.  I add it today as a courtesy.  Million Trees
You still did not change the citation for the two photo from “ecoseeds” to (4.) Dremann?

Also, my data needs a citation at the bottom, as you did with the other three.  It could be:
Without my data having any citation, it make it look as if you went each year and gathered that data, that you are presenting there? 
That data took me 19 years and driving over 3,000 miles to gather, so need that credit?
Sincerely,  Craig 

5 thoughts on “A failed attempt to restore California’s grassland costs $225,000 per acre”

  1. Regarding your failed attempt to restore native grasslands short article:
    True, it was a great expense. It was a learning experience for Caltrans. They should have talked to me first. Crait Dremann knows better. The deal is: native perennial grasses never grew in this area/soil/site prior to the arrivial of exotic annual grasses. What grew there?-probably beautiful native annual wildflowers with occasional native perennial grendilias with patches of creeping wildrye and possibly the obligate dormant Poa secunda similar to what John Muir saw when he walked across the great valley on his way to the Sierra Nevada.

    David Amme
    Wildland Vegetation Program Manager
    East Bay Regional Park District

  2. University of California scientists, working in their own backyard near Davis, probably knew as well as anyone which plants were the best candidates for use in their “restoration.” Since Amme worked for Caltrans at the time, they presumably knew he was available for consultation, but chose not to. While Ammes modestly proclaims he should have been consulted, he doesn’t tell us why his expertise is superior to the UC Davis scientists. To a non-professional like me, a recommendation to plant “probably beautiful native annual wildflowers” isn’t sufficiently specific to be helpful. Amme doesn’t explicitly claim, only implies, that the restoration would have been successful if they had used his vaguely identified wildflowers. I wonder if that is what he believes. In the April-June 2004 issue of Bay Nature, Amme wrote that, “. . . Mediterranean annual grasses are a permanent part of the California grasslands . . . The time is long overdue for an official naturalization ceremony.” That seems a good idea; it would spare us the futility and expense of further unsuccessful “restoration” exercises.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: