Who we are:
Rewild Soils is a certified soil microscopy lab and consulting service, run by Colleen Dempster - scientist, environmental steward, mother and homesteader - out of her property in Uxbridge, Ontario.
What We Do:
At Rewild Soils, we help growers understand what’s alive in their soil and then choose the right biological tools — from compost to extracts and teas — to support plant health, nutrient cycling, and resilient growing systems. Our approach brings clarity, confidence, and measurable results, not guesswork.
Our products and services include:
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Soil microscopy lab and holistic soil health testing
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Soil health consulting and restoration programs
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Hands-on workshops and learning opportunities
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Compost, compost tea/extract, and brew kits
If you're interested in having a positive impact on the environment, food soverenty, and supporting community,
you're in the right place!
Soils Lab
We have been operating a Soil Food Web-certified soil microscopy lab since 2022.
Colleen has documented hundreds of soil, compost, and compost tea/extract samples, and has a deep understanding of what is "normal" for Ontario conditions, and what can be improved.
Visit our "Soils Lab" page for example reports and more information.
![20260421_155024[1].jpg](https://static.wixstatic.com/media/05be8d_afd388b99dda4e25b7793e32004f2f75~mv2.jpg/v1/fill/w_170,h_253,al_c,q_80,usm_0.66_1.00_0.01,enc_avif,quality_auto/20260421_155024%5B1%5D.jpg)
Rewild Composts and Inoculum
Our high quality composts and compost blends are so much more than organic matter. They are concentrated biological inoculums, ready to go to work in your soil.
We make thermal aerobic compost as per Dr. Elaine Ingham's methods, Johnson-Su compost, and red-wiggler vermicompost on site at Rewild Uxbridge.
All of our composts are quality-controlled using a microscope and guaranteed to contain a diverse, complete and active soil food web. We call it Biologically Complete. This is the stuff you want for making compost teas and extracts!
Testimony:
Rewild Soils... is by far the best compost I have EVER witnessed"
- Yousef Abdelsalam, Soil Food Web Student, Compost Toronto member, regenerative entrepreneur
Consulting and workshops
As a former colleage teacher and with over a decade of microscopy and composting experience, Colleen Dempster speaks with passion and expertise while consulting or conducting workshops.
We host workshops from Rewild Uxbridge, but are happy to book a workshop or presentation at your facility.
Colleen is currently wrapping up her Soil Food Web School Consultant Certification, and is gaining experience with on-site soil health analysis and building soil restoration programs for farmers, gardeners, arborists and ecosystem restoration groups.
We make and apply!
We can make up to 1000 gallons of extract on-site, or deliver up to 25 gallons of finished compost tea or extract.
We do small applications (up to 5gal product or half acre) using watering cans and a backpack sprayer. If needing larger areas, you will need your own sprayer.
Do It Yourself!
For those who want to take a hands-on approach, we provide the tools and guidance.
Tools:
We rent the 100X Hiwassee compost extractor, capable of producing 250 gallons of extract per hour — enough to treat up to 15 acres per hour.
For compost tea, we manufacture small and medium-scale compost tea brewers designed to treat residential properties up to one acre. You can brew using your own compost and recipe, or use our biologically tested compost and ingredient kits. Refill ingredients are available through our Products page.
So whether you're buying the finished product from us or making your own, we are here to help you do it and do it well!
Where We Serve:
We are located in Uxbridge, Ontario and will deliver/do site visits within a 100km radius (Orillia, Kingston, Niagara, Guelph).
Due to species adaptation to local geography and climate, and potential to spread invasive species, we do not recommend sourcing biological inoculums outside of bioregions or vast distances.
We Serve:
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Market gardens & small farms focused on soil health
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Cannabis growers looking for organic inputs
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Arborist companies looking to enhance tree resilience and survival
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Ecosystem restoration practicioners looking to match soil succession with the desired successional stage of the habitat they are restoring
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Farmers and researchers looking to study soil biology and test biological amendments
Join our Compost Club!
The Rewild Soils Compost Club is a community-based program for people who want access to high-quality biological compost, compost tea, and extracts—while helping support local composting, soil restoration, and community education initiatives.
Perfect for growers, gardeners, and land stewards looking for consistent biological support throughout the season.
Join our community mailing list for workshop announcements, events, plog posts, soil biology tips, Compost Club projects, and seasonal product updates.
Farming microbes brings me so much joy. Soil building is a process that can take hundreds of years in nature, but can be accellerated with careful composting. Adding clean compost, full of biology, increases the water holding potential of soil, decreases soil erosion, grows more nutritious, resilient plants, fosters biodiversity, decomposes toxins, and more...
...it is a positive human impact in a world full of challenges.
Soilfully yours,
Colleen Dempster
We honor and acknowledge the first nations people who lived in this area for centuries and worked with the land to enhance it's biodiversity: the Haudenosaunee, Wendat, and Anishinaabec peoples. It is our intention to learn from traditional indigenous knowledge and apply it to soil "rewilding", by working with people as part of nature.