Short answer: Cotton burr compost is compost made from the burrs, stems, leaves and short lint that cotton gins clean out of seed cotton. Like other finished compost, it adds organic matter that helps clay soil drain and helps sandy soil hold water, and it can be worked into beds or used as a thin top-dressing on lawns. Texas A&M AgriLife Extension recommends mixing 1 to 2 inches of compost into the top 6 to 8 inches of a bed. Buy it fully composted, ask what was applied to the cotton, and look for it at local cotton gins and garden centers in cotton country.
What cotton burr compost is
Every bale of cotton leaves material behind at the gin. University of Georgia Extension estimates that each 480-pound bale produces about 150 to 200 pounds of gin trash. Before ginning, cleaning machines strip out burrs, sticks, leaves, soil and bits of seed and lint, and that pile of byproduct is the raw material for cotton burr compost.
How much of that is burr depends on how the cotton was harvested. In USDA-ARS research on the Texas High Plains, burrs made up about half of the foreign matter in stripper-harvested cotton. That means gins in stripper country, such as those around Lubbock, handle a lot of burrs each season.
Some gins compost this material themselves. In a 2009 survey of gins in Arkansas, western Tennessee and western Mississippi, researchers found gins composting their trash and applying the compost as mulch or soil amendment on gardens, flower beds and crop fields.
How it's made
Composting turns raw gin trash into a stable, dark, crumbly material. Texas A&M AgriLife Extension describes the general process for any compost: organic material such as yard clippings, cotton gin trash or manure is piled up, bacteria raise the temperature, and turning the pile keeps it aerobic until it matures.
For gin byproduct specifically, a University of California study published in Transactions of the ASAE (1981) found that gin trash fines composted in about five weeks when kept near 40% water and mixed every four days. That composting destroyed the weed seeds and the Verticillium wilt fungus the researchers tested.
For the step-by-step version, see how to compost cotton gin trash.
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Cotton burr compost benefits
For clay soil
Clay is where most buyers start. Texas A&M AgriLife Extension says compost "helps clay soils drain and improves soil porosity, allowing plant roots to easily penetrate the soil." In sandy soils, it does the opposite job, helping hold water and nutrients. Oklahoma State University Extension lists cotton burrs, along with compost and peat, as organic matter that can be mixed into soil that is too sandy or too heavy with clay.
The benefits are those of organic matter in general. Extension sources don't treat cotton burr compost as a miracle product, and none of the sources here compare it head-to-head with other composts for clay soil.
For lawns
Texas A&M AgriLife Extension says compost can be worked into the soil before planting new turf or used as a top-dressing on established lawns. On an existing lawn, it recommends verticutting or aerating first so the compost reaches the root zone, then raking to work it into the openings.
As a nutrient source
Compost is a soil amendment more than a fertilizer. Texas A&M notes that most finished compost is near neutral in pH, contains low levels of nitrogen, phosphorus and potassium, and releases small amounts of nutrients slowly. Composting does concentrate some nutrients in gin byproduct. A 2024 study in the Journal of the ASABE found that composted cotton gin byproducts had at least 55% more total nitrogen and phosphorus than fresh byproducts, but about 35% less potassium. For more detail, see nutrient properties of cotton gin compost.
How to use cotton burr compost
These are Texas A&M AgriLife Extension's general compost guidelines, which apply to cotton burr compost:
| Use | Guidance |
|---|---|
| New garden or flower beds | Spread 1 to 2 inches over the bed and mix into the top 6 to 8 inches of soil |
| Mulch around established plants | Apply a thin layer, 1/2 to 1 inch, without disturbing roots |
| Established lawns | Top-dress after verticutting or aerating, then rake into the openings |
| Containers | Mix about one-third compost with other materials such as milled pine bark and sand; don't use pure compost |
To estimate how much to buy, Texas A&M says it takes about 1/2 cubic yard of compost (6 bushels) to cover 100 square feet 1 inch deep.
Two more tips from the same guide:
- Amend the whole bed, not the planting hole. Compost added only to a hole can act "like a sponge in a bathtub," holding water and discouraging roots from growing into the surrounding soil.
- Don't use pure compost as potting soil. Salts leaching from the material may damage roots.
Cautions before you buy
Use only finished compost
Texas A&M warns that compost used before it's ready can make plants turn yellow and look stressed, because soil microbes still breaking it down compete with plants for nitrogen. Finished compost no longer resembles the original material, no longer heats up, and has a dark, crumbly look and earthy smell.
A separate Texas A&M AgriLife publication adds that mature compost is often high in carbon and low in nitrogen, so microbes may "steal" nitrogen from the soil after it's applied. Its rule of thumb: when using low-nitrogen compost, add about 20% more nitrogen fertilizer than the plants alone would need, and soil test before future applications.
Weed seeds
Gin trash carries weed seeds. The 2009 Weed Technology survey found 25 weed species in gin trash samples, and viable Palmer amaranth seed was still present in the surface layer of compost piles after two years. No germinable seeds were found deeper than about 10 inches after one year. Hot, well-managed composting matters, and so does avoiding the crust of an old, unturned pile.
Chemical residues
Ask what was applied to the cotton. Oklahoma State University Extension advises gardeners not to use herbicide-contaminated cotton burrs as mulch. The University of California composting study found that residues of the defoliant DEF and the herbicide paraquat were not broken down by composting, even though weed seeds and disease organisms were destroyed. If you're growing food, it's reasonable to ask the seller what was used on the crop and how long the material was composted.
Where to find cotton burr compost
Depending on the supplier, cotton burr compost may come bagged or in bulk. Prices and product names vary by region, so compare local options and ask questions before you buy:
- Is it fully composted, and for how long?
- What was it made from? All cotton burrs, or blended with manure or other material?
- Is a test report available? Ask for nutrient content, pH and salts if you have them.
- Is it screened? Finer material spreads more easily on lawns.
- Bulk or bagged? Bulk suits large beds and lawns; bags suit small projects.
In cotton-growing areas, start with the nearest gin. Some gins compost their own trash, so ask whether yours does. Raw gin trash is a different product; see cotton gin trash for sale for what to ask a gin before you load a trailer. Gins with large byproduct volumes are concentrated in these areas:
- Cotton gins in Lubbock County, TX
- Cotton gins in Hockley County, TX
- Cotton gins near Lubbock and the South Plains
- Cotton gins in Pinal County, AZ, including Pinal Gin in Stanfield
- Cotton gins in Kings County, CA
Gins are busiest from fall into winter. Check cotton ginning season by region to see when yours is running, and top 5 uses for cotton gin byproducts for other ways gin byproduct gets used.
Cotton markets, every trading day. Curious about the crop behind your compost? The Cotton Wire covers the cotton market every trading day. Subscribe to The Cotton Wire
FAQ
What is cotton burr compost made of?
The burrs, stems, leaves, soil and short lint that cotton gins remove from seed cotton, composted until stable. Some products may be blended with other materials, so ask the seller.
Is cotton burr compost good for clay soil?
Yes, as a source of organic matter. Texas A&M AgriLife Extension says compost helps clay soils drain and improves porosity. Mix 1 to 2 inches into the top 6 to 8 inches.
Can I put cotton burr compost on my lawn?
Yes. Texas A&M recommends top-dressing established lawns after aerating or verticutting, then raking the compost into the openings.
How much cotton burr compost do I need?
About 1/2 cubic yard covers 100 square feet 1 inch deep, according to Texas A&M AgriLife Extension.
Where can I find cotton burr compost near me?
Check garden centers and landscape suppliers, especially in cotton-growing regions, and call nearby cotton gins to ask whether they compost their gin trash or know who does. Use the county pages on cottongins.org to find nearby gins.
Can cotton burr compost carry weeds or chemicals?
It can if it's poorly composted. Research has found viable weed seed in the surface of gin trash piles, and some cotton chemicals survive composting. Buy finished compost and ask what was applied to the crop.
Sources
- University of Georgia Extension. Using Cotton Byproducts in Beef Cattle Diets (Bulletin 1311): gin trash per bale. https://fieldreport.caes.uga.edu/publications/B1311/using-cotton-byproducts-in-beef-cattle-diets/
- Wanjura, J. D., W. B. Faulkner, E. M. Barnes, G. A. Holt, and M. G. Pelletier. "Crop Residue Inventory Estimates for Texas High Plains Cotton." Proceedings of the 2012 Beltwide Cotton Conferences, pp. 542–552: burr share of foreign matter by harvest method. https://www.cotton.org/beltwide/proceedings/2005-2022/data/conferences/2012/papers/13220.pdf
- Norsworthy, J. K., K. L. Smith, L. E. Steckel, and C. H. Koger. "Weed Seed Contamination of Cotton Gin Trash." Weed Technology 23:574–580 (2009): gin disposal and composting, weed species, seed survival. https://doi.org/10.1614/wt-08-146.1
- Mowrer, J. Animal Waste, Biosolids, and Composts: The ABCs of Organic Soil Amendments (SCSC-PU-234). Texas A&M AgriLife Extension: composting process, cotton gin trash as feedstock, nitrogen tie-up rule of thumb. https://mytexas.ag.tamu.edu/wp-content/uploads/2026/03/the-abcs-of-organic-soil-amendments.pdf
- University of California (Curley, Knutson, et al.). "Composting Treatment for Cotton Gin Trash Fines." Transactions of the ASAE (1981): composting conditions and time, weed seed and Verticillium dahliae destruction, DEF and paraquat not degraded. https://my.ucanr.edu/repository/fileaccess.cfm?article=159280&p=JDDILS
- Texas A&M AgriLife Extension. Earth-Kind Landscaping, "Chapter 5, Utilization of Compost and Other Landscape Refuse": clay and sandy soil benefits, application rates, lawn top-dressing, potting mix, finished compost. https://aggie-horticulture.tamu.edu/earthkind/landscape/dont-bag-it/chapter-5-utilization-of-compost-and-other-landscape-refuse/
- Hillock, D., and M. Schnelle. Roses in Oklahoma (HLA-6403). Oklahoma State University Extension: cotton burrs as soil organic matter and mulch; avoid herbicide-contaminated cotton burrs. https://extension.okstate.edu/fact-sheets/roses-in-oklahoma
- Alege, F. P., C. D. Blake, S. P. Donohoe, and J. W. Thomas. "Nutrient Properties of Fresh and Composted Cotton Gin Byproducts and Cattle Manure for Soil Amendment." Journal of the ASABE 67(1):151–159 (2024). https://doi.org/10.13031/ja.15766
