Spoonful of GROZOME Compost with a magnified inset showing particle details.

Got Microbes?

A teaspoon of GROZOME compost contains more living microbes than humans on earth.

What Can You Expect

With a seasonal treatment of GROZOME, your soil becomes biologically complete— and when your soil thrives, your plants thrive too. Here’s what happens:

  • Plants better resist pests and diseases
  • Improved root development and growth
  • Soil retains moisture better (less watering!)
  • Increased nitrogen-fixing and nutrient cycling
  • Reduced need for synthetic fertilizers and pesticides
  • More nutrient-dense fruits and vegetables
  • All with nothing more than adding a handful of GROZOME to a bucket of water for your watering routine.

What's in GROZOME


Thoughtfully and sustainably sourced on farm plant feedstocks which are small batch composted exceeding biologically complete standards to maximize native microbial biodiversity and feed your soil. The following are found in GROZOME Plant Probiotics.

  • Arborist Wood Chips

    Aged organic wood material providing carbon-rich structure and fungal habitat

  • Bamboo

    Nitrogen-rich organic crop residues from sustainably grown bamboo

  • Leaf Compost

    Aged organic leaf material rich in beneficial fungi

  • Activated Biochar

    Micronized bamboo biochar activated with wood vinegar and aged compost culture

  • Non GMO Cracked Corn

    Clean, verified nitrogen source for microbial activation

  • Humic and Fulvic Acid

    Created naturally as organic matter breaks down during controlled aerobic composting

  • Proprietary microbial biodiversity

    Over 3,900 genera of beneficial bacteria, fungi, mycorrhizae, and other microbes collected from native plant biomes from our travels.

  • Bamboo Wood Vinegar

    Bamboo Wood Vinegar (Pyroligneous Acid) — Naturally occurring byproduct captured during biochar production, used to activate biochar

  • Algae

    Thoughtfully curated but naturally occurring and cultivated in our fresh water tanks feed by on-site spring water. Aids in microbial diversity and plant stress adaptation.

Diagram of a soil food web with GroZome branding and text.

Biologically Complete

What Does Biologically Complete Mean?

A biologically complete soil or amendement has a balanced ratio of fungi to bacteria (generally close to 1:1)— and contains all the essential micro-life forms at the appropriate minimum populations, including:

  • Protozoa
  • Amoebae
  • Nematodes (bacterial, fungal and predatory feeders)

This is the gold standard in soil biology — and GROZOME is proud to meet and exceed it.

Understanding what GROZOME is and what it is not

  • GROZOME IS NOT:

    • Not a fertilizer
    • Not a quick fix
    • Not made with manure or food waste
    • Not a product that harms your soil
    • Not compost
    • not lab-made or GMO
    • Not contaminated with heavy metals, PFOAs, or toxins
  • GROZOME IS:

    • A biologically complete soil-building system
    • Macro and micronutrients that feed the microbes
    • Safe to use by all growers and around pets
    • Easy to use and a habit worth forming
    • A living, biologically complete microbial community
    • A product rooted in nature and science
    • OMRI Certified for use in Organic farming
    • Sable Carbon backbone

Trusted and Tested

GROZOME delivers over 3,900 species of beneficial microbes - including bacteria, fungi, and other complete soil food web organisms.

Through advanced metagenomic testing, GROZOME has been shown to contain:

  • 2,500+ bacterial species across diverse functional groups

  • 1,100+ fungal species, including beneficial decomposers and biocontrol allies

  • A balanced profile of aerobic, facultative, and microaerophilic organisms

  • Naturally occurring mycorrhizae, yeasts,  algae

This living biological inoculant is more than compost—it’s a powerful ecological tool for activating soil systems and supporting plant-microbe partnerships.

Exceeds standards of the US Composting Council Seal of Testing Assurance (STA) with:

  • 90% Germination
  • Ideal Water Holding Capacity
  • 100% Vigor
  • Extremely Low Salinity
  • Near Neutral PH
Person using a microscope with text overlay 'Under the microscope with Co-founder Everest Holmes'.

Exceptionaly clean and safe for plants, pets, and people

Test results average over 50 times lower than federal limits on fecal coliform and heavy metal concentrations. Recharge your plant biomes with all the goodness GROZOME has to offer, setting a new standard for beneficial bioactive soil inputs.

Trusted nationally by both traditional and regenerative farmers - used on 40,000 acres annually through our partner Hiwassee Products LLC

Scan the QR code on each bag for real-time batch test results.

Our Sustainability Commitment

We believe better gardening should also mean a better planet.

  • 8% of each GROZOME bag is bamboo biochar produced in our clean-burning pyrolysis unit

  • We use regenerative crop waste (non-GMO and herbicide spray free), wood chips from regional tree services, and waste from sustainably harvested bamboo as compost feedstocks

  • Packaged in OXO biodegradable bags

  • No animal inputs or post-consumer waste

  • For every bag of GROZOME sold, we donate one bag to local gardening nonprofits, native plant and soil health initiatives. Learn more about our Biomes for Better program at link below.

Learn more about our social giving program 

Case Studies

Real results, real soil.

GROZOME FAQs

Find solutions to your frequently asked questions regarding GROZOME.

Biologically complete means that GROZOME contains the full Soil Food Web, beneficial bacteria, fungi, protozoa, amoebas, and nematodes in the right ratios. This balanced microbial ecosystem promotes nutrient cycling, disease resistance, and long-term soil fertility without synthetic inputs.

Unlike traditional composts, GROZOME is tested and verified as a high quality biologically complete, microbial inoculant, meaning that our formulation offers unmatched microbial biodiversity in every scoop. Also GROZOME is free from synthetics, GMOs, animal waste, and lab grown filler microbes. In addition, GROZOME contains micronized bamboo biochar, wood vinegar, mycorrhizal fungi, humic and fulvic acid along with other micronutrients to feed the soil microbes. GROZOME can improve any compost or potting soil by adding the essential biology and nutrients a living soil requires.

Yes! GROZOME works on all, from potted plants and raised beds to full landscape installations and agricultural plots. Due to the high levels of biodiversity in GROZOME, our living microbes adapt to different plant types, forming tailored microbial partnerships that help each biome thrive.

Building Better Biomes is not a quick fix, it takes time. Anytime you water, add GROZOME. At the very least, we recommend a regular application every two weeks for an entire growing season or more intensively after major soil disruptions (tilling, replanting, etc.). GROZOME Soil Health Club members receive automatic deliveries every 3 months to keep soil biology active and effective year-round.

Absolutely. GROZOME is made only with plant-based ingredients, without any synthetic chemicals or toxic compounds. It’s safe to touch, smell, and use around animals, children, and beneficial insects like bees and butterflies, though it is not a food or beverage for human consumption. GROZOME is required by large farming groups to be tested regularly and heavy metals, PFOAs, microplastics and other toxins must be undetectable.

GROZOME under the microscope

Want to Go Deeper?

Curious about how microbial life really works in soil? Explore the science behind GROZOME