Photo: Sarah Wolfskehl
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About Black Earth Compost


Our mission is to nourish the soil to grow healthy plants in Massachusetts, with an emphasis on food production by any and all!  Made in small batches, our compost is without grass clippings but instead utilizes the riches of a bounty of food scraps.

Compost is an excellent soil amendment to add to your yard for soil and plant health. Use it as a mulch for moisture retention, mix it into the soil before you plant, or topdress your lawn, trees and shrubs to provided added nutrients and organic matter.

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QUALITY COMMITMENT

Our compost is rich in humus, nurtures beneficial micro-organisms, is free of any viable weed seeds, and contains an abundance of immediate and slow release nutrients.

  • A Broad Range of Ingredients to support a bio-diverse compost
  • No Grass Clippings that contain herbicides, pesticides, and insecticides
  • Free of Weed Seeds
  • Lab tested for optimal composition (scroll down for details)*
  • Screened to 5/8ths inch 
  • Made in MA! Our compost sites serve as local sources of nutrients, making our state more resilient. Manchester, MA; Groton, MA; Framingham, MA

QUALITY ASSURANCE

Lab Analysis - We have our compost tested at University of Maine each year for nutrients, pH, salts and C:N ratio. Additionally we test it for heavy metals (lead, nickel, cadmium, chromium, zinc, copper, and arsenic).

Plant Trials - We believe that plants don’t lie, and we know that analytical reports from laboratories won’t tell the whole story. That’s why we grow vegetables, fava beans and clover in our compost in a controlled plant. Clover and fava beans for the presence of persistent herbicides, using published bioassay protocols, and vegetables to show general vigor as they are heavy feeders.

BiologyWe test the compost for communities of bacteria, fungus, protoctist and nematodes. We tend to be a bacterial dominated compost, but over the long term fungal populations establish.  Our compost is great for making compost tea. 

Email BulkSales@BlackEarthCompost.com or call 978-290-4610 ext. 3 if you have questions.

A note on pH: Compost normally shows pH 7 to 8 if it is rich in nutrients (especially for food scrap composts). This does not mean that it is going to dramatically send your soil’s pH sky high. The high pH of compost is attributed to the initial pool of 'ready to go' soluble nutrients. After that, the pH comes down to between pH 6 to 7. The compost will continue to release nutrients as the organic matter decomposes over the season.

Nutrient Lab Test Herbicide Trials Food Web Test Food Safety
Modernization Act
2022 Compost
2022 Compost
2022 Compost 2022 FSMA Report for Farmers
2021 Compost
2021 Soil
2021 Soil - 1
2021 Compost - 1
2021 Compost - 2
2021 Compost - 3
2021 Compost 2021 FMSA Report for Farms
2020 Compost
2020 Soil
Not documented 2020 Compost
2020 FSMA Report for Farms
2019 Compost
2019 Soil
Not documented 2019 Compost -Last year of no FSMA law
for small veg growers-

Heavy Metals: This graph shows metal content found in our compost and soil blend compared to state thresholds.  

2022 Report of Annual PFAS Analysis: This report shows the content of fluorinated compounds found in our compost compared to state thresholds and other contaminated and non-contaminated soils. Note that our compost meets the criteria to be used in the state's strictest use case: compost can be used on a farm that sits over a drinking water supply and grows food where children are present.

2021 PFAS Lab Analysis



*Some plastic such as fruit stickers and wrap may be found in the compost because we are sourcing the food scraps from the community.

    HOW WE MAKE COMPOST

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    Building Community Food Projects

    In 2020-2022 we proudly supported the following community food initiatives with raised beds or finished compost.

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    Supporting Local Farms With FarmWorks

    With the support of our customers, we were able to offer compost at a reduced rate to the local farms listed below in 2020-2022. 10 cents of each bag of compost sold goes to our FarmWorks program. Join a Community Supported Agriculture (CSA) program at one of these farms or buy their produce to complete the full circle sustainability loop.