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Native Grass Sod
What is This Treatment?
This work involves placement of commercially grown sodded grass that is composed of a mixture of drought-tolerant native California grass species.
When to Use This Treatment?
- Wherever immediate 100 percent cover of disturbed soil areas is required.
- Biofiltration strips and Biofiltration Swales.
- Provides immediate soil cover, providing immediate control of surface erosion.
- Montana State University research data showed that a freshly tilled 2.5:1 (H:V) slope treated with hydroseed yielded 1-2 tons/hectare/year while the native grass sod from Delta Bluegrass yielded only 0.6 tons/hectare/year.
- Immediate cover greatly reduces competition from invasive weed species.
- Low long-term maintenance and establishment costs due to the ability of sod to reduce weed emergence and survival.
- Controlling erosion at the source is much more cost effective than trying to remove sediment or metals from stormwater runoff downstream.
- Sod strips placed at the toe of the slope remove soil particles from surface runoff before it leaves the project site.
- High initial cost. Materials cost is expected to decrease as the supply increases.
- May require supplemental irrigation.
Technical Design Tips:
- Amend soil with compost and/or slow-release organic fertilizer
- Pre-germinate and kill weeds if possible.
- Install just prior to the rainy season if possible.
- Supplemental irrigation may influence dominance of certain native grasses over others.
- Supplemental irrigation may increase competition from adjacent invasive annual weeds.
- Recommended grass specie mixes vary by ecoregion. The best mixes develop a strong, contiguous root mat, easing harvest as well as precluding propagation of weedy species from the underlying soil seed bank.
- Verify availability (geographic location and sod mix species) before specifying this product. Contact Delta Bluegrass in Stockton. Other suppliers expected soon.
Consider Using With:
To effectively treat sites with poor soils (compacted, nutrient poor, or poorly draining), consider combining this treatment with:
Plans and Details:
- No Standard Plans or details required.
- $1.00 - $4.00 per square foot (2010) for quantities of 10,000 - 30,000 square feet.
- $2.25 per square foot (2010) weighted average for quantities between 10,000 - 30,000 square feet.
2008 Montana State University Research Report. Using Reinforced Native Grass Sod for Biostrips, Bioswales, and Sediment Control.