Bio Ag EM Fertilizer - Microbial Inoculant & Soil Amendment

Bio Ag EM Fertilizer is a powerful microbial inoculant and soil amendment that helps bring tired soil back to life.
It works like a probiotic for your garden — adding beneficial microbes that support healthier roots, stronger plants, and more productive soil, season after season.

Bio Ag is also one of the best products you can use to cure biochar. Its rich microbial community quickly colonizes biochar’s microscopic pores, turning it from a dry, empty carbon sponge into a fully charged, living soil booster. When applied together, the combination delivers stronger plant growth, faster establishment, and better long-term fertility.

It’s extremely affordable to use — just a 1:1000 dilution — making it ideal for large gardens, lawns, and farms. Choose a liter screw-top bottle or a hose-end sprayer. Clear instructions are included for seed starting, lawn care, foliar spray, compost activation, agriculture, post-harvest use, and more. For best results, pair it with organic matter like compost, leaves, or grass clippings.

Bio Ag EM Fertilizer brings life back into your soil, giving your plants the foundation they need for stronger growth and bigger harvests.

Regular price $21.00
Bio Ag EM Fertilizer - Microbial Inoculant & Soil Amendment
$21.00

Customer reviews

Real feedback from growers who use this product in the field.

Mike T. Verified buyer
Oct 2021

These are by far the best probiotics I have used in my 30 plus years of searching for effective probiotics. Nothing has come close.

Vanessa Verified buyer
October 2025

I’m happy with my purchase. I think that my plants are stronger since using this product.

Tim W. Verified buyer
October 2025

Works like a charm, thanks

Alex M. Verified buyer

Game changer for our soil

October 2025

This is the third year using Bio Ag on the raised beds both as a soil drench and a foliar spray, and the results have been much better than expected. As the plant health has improved from the increased microbial activity, both the quantity and quality of the harvested vegetables has improved.

Doug Verified buyer

Game changer for our soil

October 2025

Works great! I use this for the composting of kitchen waste, grass clippings, and leaves. There does seem to be a noticeable difference with the grass clippings and leaves breaking down faster.

Marc C. Verified buyer

This product is great!

October 2025

I used this on my grass after I dethatched my grass and put down some seeds. My grass has never been so green and growing so well. I tried a different brand and it did not work as good as this product. I spend a lot of time managing my grass. I have clay soil and Kentucky bluegrass in Michigan. I recommend this if your grass looks like it needs a boost.