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Project sets cost of California Native Grassland Restoration at $225,000 per acre!

The history of the UC Davis/Caltrans grant project shown on this website, starting on Feb. 11, 2003, in Yolo County at the I-505, Road 14 exit test plot site in the Sacramento Valley, California:


(Just across the Interstate, there's a second native plant test plot, planted by the Yolo County RCD, see below).

First attempt, a couple of acres drill-seeded with several species of native grasses, seedlings are 2 inches tall, Feb. 11, 2003.

Above: First attempt of Dunnigan Hills Caltrans test plot, looking south, February 11, 2003.

Above: The Yolo County RCD test plot, Dunnigan Hills, across I-505 from the Caltrans plot, March, 2003.
Some of the hummocks in background are the exotic perennial grasses. Checking the area in September 2004, there was a stand of about 50% cover of the native perennial grass Stipa (Purple Needlegrass).

First failure, Dunnigan Hills UC Davis/Caltrans site, June 2003. This first-year's planting was declared a failure and the site was sprayed in May and a second attempt planned for autumn 2003
...What is all that brown stuff?


Lodged polyploid ryegrass, six inches deep!
This is one of the aggressive pasture-types developed in Oregon, now showing up here in California as weeds.

Above: October, 2003, with the Dunnigan Hills site burned and ready to reseed to try again.

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SECOND TRY: January 18, 2004: Photos below show the Dunnigan Hills test plot second attempt underway.

January 2004, part of the site had been recently mulched with a light covering of native needlegrass straw (Stipa or Stipa). The exotic grasses have been managed over the whole two acres, but what is left is a lot of bare soil that's eroding, plus seedlings of broadleaf weeds: mostly filaree, mustard, dock, milk thistle, and vetch. Yellow star thistle seedling not observed yet, but they don't usually show until later in spring.

Second failure...Oh, no!...May 2004, the upper portion not resown...is solid yellow star thistle!

However, in May, 2004, the Dunnigan Hills site did have about 1,000 plants of various native grasses.

AUGUST, 20, 2004. The upper portions of the Dunnigan site formerly covered with yellow starthistle was mowed earlier in the summer. Wild oats encroaching, plus some very robust "Blando" brome into the former native grass test plot area.

Former upper test plot area.

Test plot area, arrow is where the line of wooden stakes is located.

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Third replanting attempt, July 12, 2006 - Another replanting attempt, unfortunately failing:

Between September 2005 and spring 2006, the test plot was plowed and resown by drill-seeding with Elymus glaucus and some four-inch tall Purple Needlegrass, that is barely surviving as an understory beneath the weeds. This test plot has been treated like an annual flower-bed, resown every year and hoping for the best. No ecological restoration technologies have been used or successful techniques invented on-site, that would guarantee plant survival and establishment.

Fourth planting attempt, spring 2006, UC Davis took over the Yolo County RCD test plot area, and it was plowed and replanted, by drill seeding on 8 inch-centers, mostly Purple Needlegrass and some Elymus glaucus, which has formed a nearly solid stand by July 2006. Each plant is growing on 4-8" centers within the drill-row. However, in the distance you can see scattered wild lettuce and mustard plants, and even at these very low amounts, could eventually start the domino-like collapse of this nice planting.

August, 2007, planting is still intact.

Notice the wide spaces, without other species of native plants between the native bunchgrass plants. "Vacancies" in the planting can allowing weeds to colonize. Islands of weeds, once they get established, like patches of mustard, can unravel the planting from within. Or star thistle can move into the bare spaces, like a wave, from the edge.

August, 2008...Oh, no, what's all that spiny stuff invading the native grassland? Mostly yellow star thistle coming in from the edges! The green in the center, is the wild lettuce starting the destruction of the planting from within. About 10% of the planting is already solidly infested, and will probably last another ten years under drought conditions, or 2-4 years with normal rainfall.

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Wild oats still invading from the left, and the star thistle and mustards from the right.

Solid star thistle, and star thistle plus mustard

Star Thistle (left) plus Stipa native grass (right) in the east side test plot, when unmolested by the weeds. All of the Elymus glaucus plants have died.

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FIFTH PLANTING ATTEMPT. The west side plot was resurrected by a professor at UC Davis, and replanted in autumn 2008 with a drill seeder. Then, the plot mowed in late 2009 and late spring 2010. Only 15 pounds per acre of Stipa cernua, which produced only about 30% coverage. Photos August 23, 2009

Update August 2010

What a typical I-5 or I-505 interchange, how it looks in August, solid yellow star thistle

Dunnigan Hills test plot site, NW corner where nothing has been planted yet, solid yellow star thistle.


East side site, mustards moving in from the west.

Mustards moving in on east side plot.

The unmolested Stipa grasslands.


The edge of the mustards, eating the Stipas for lunch, like a giant amoeba.


West side plot, with about 30% Stipa cover, mowed in early spring.


Stipa cover on west side plot.

Mowed Stipa, too close, regrowing.

(3.) Only one native species of grass survived, and no other natives were sown to fill the niche of the broadleaf weeds, like anything from the sunflower family to take the place of the yellow star thistle, for example. No legume family, no Indian paintbrush family, no milkweed family, etc.

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Update August 2011 - Are we ever going to see solid native cover on these test plots?


East side plot baled, probably to manage the weeds. Star thistle plants mixed in the bales--what you can do with these bales except compost them? A 100-pace toe-point transect only produced 26% native grass cover, 3% mustard and the rest were annual weeds.

West side looking OK, with yellow star thistle moving in from the north, and measuring a 100-pace toe-point transect, 46% Stipa cover, 2% Elymus glaucus, 32% annual grasses, 15% wild oats, and 5% yellow star thistle.

Old plants of Stipa on the west side, 5-8 inches in diameter

Oh, no...what is that infestation of yellow star thistle, coming in from the north?

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UPDATE JANUARY 2012

The west and east side project have both stabilized at exactly the same amount of native plant cover, all Stipa pulchra, at 28%, with 72% weed cover.

West side plot

East side plot, mustards coming in thick, as predicted.

Little or no rainfall in January and February, has severely knocked back the annual grass weed seedlings, so the perennial native Stipa has been given an advantage and in the West plot has increased to 38% cover, and also 2% of native lupine is now showing up, probably from dormant seeds that were in the soil underneath the weeds. The remaining 60% weed cover on the West side is a 20% cover of wild oats, 8% red brome, 6% Blando brome, and 2% cover each of yellow star thistle, and bindweed.

West side plot getting star thistle infested again. The West side was mowed to about two inches tall, and was 34% weeds, 62% Stipa and 4% yellow star thistle. The East side plot was not mowed, and was 72% weeds and 28% Stipa. Medua head grass and tumbleweeds present in East side plot.

West side test plot, even worse than the East side, with 92% weed cover mostly yellow star thistle, and only 8% Stipa cover.

The real surpirse, was once you got away from the mowed roadside, the unmowed Stipa was producing 84% cover, with only 12% wild oats, 2% yellow star thistle and 2% mustard! The lack of rainfall all December then all February may have given an advantage to the Stipa, plus not mowing.

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Another series of first-attempt plots, along I-80:
A second Caltrans native grass test plot is along I-80 near Dixon, photographed March, 2003., both sides of the Interstate in the shoulder. Photos show native grasses, drill-seeded and a few inches tall.

These I-80 test plots were half-way between Midway Road exit and the Dixon West "A" Street exit.If you are traveling eastbound from Vacaville, the plot was 1.3 miles past the Midway Road exit, after where the high power line crosses, and before you get to a line of trees and the Phone Call box 80-342.

Traveling Westbound from Sacramento, past the Dixon exit, the test plot started at the Vacaville/Fairfield/San Francisco mileage sign and Call box 80-343 (PM 34.00) and went toward where the high power lines cross the Interstate.

This $90,000 per year, 5-year grant is Caltrans second major contract in the agency's history to study the conversion of roadside exotics back to local native plants. Details of the grant can be seen at HERE

---See a checklist of ten items to get faster successes: https://www.ecoseeds.com/talk.html

Other Caltrans Roadside Vegetation Programs:
Adopt-A-Highway "WILDFLOWER PLANTING"

The "Wildflower Planting" program's desired result? Perhaps that Caltrans hoped for when the program was initiated, was adoptees might develop at no cost to Caltrans successful "wildflower" roadside vegetation with low maintenance costs, better than the flammable annual exotic grasses and exotic weeds normally along California's roadsides?

Unfortunately, none of the California native "Wildflower Plantings" over the last decade, seem to be successful, and driving up and down the State you will see numerous "Wildflower" signs, with no fields of California native wildflowers at the various sites. The program has resulted in providing cheap advertising for companies, without the companies having to pay the minimum of $200,000-500,000 per acre that a successful wildflower planting in California could cost, as the UC Davis project has established.

Caltrans' "Wildflower Planting" program should be discontinued state-wide, until the costs of successfully establishing a wildflower planting drops into a price per acre that civic groups or commercial businesses can actually afford.