EDUCATION · TERRAFERM
EM1 Effective Microorganisms
What “EM1” actually refers to, what activation means, and where it fits alongside TerraFerm’s ASAM brewing kits.
What EM1 Is
“EM1” is the common name for one specific, commercially formulated version of Effective Microorganisms (EM) — a co-cultivated blend of lactic acid bacteria, photosynthetic bacteria, yeasts, and other beneficial microbes, sold as a concentrated liquid inoculant. It’s the same underlying science covered on TerraFerm’s What Are Effective Microorganisms page — EM-1 is one supplier’s packaged version of that broader category, not a different technology.
Different suppliers sell their own version of effective microorganisms, and formulations can vary slightly in exact strain composition and concentration.
What “Activated” Means
Commercial EM products typically ship as a concentrate — stable, and ready to use straight from the bottle. “Activation” is the process of diluting that concentrate with 90% water and a food source (5%) (usually blackstrap molasses) and letting the mixture ferment for one to two weeks before use. This multiplies the microbial population and produces a larger usable volume from a small amount of concentrate.
Activated EM has a much shorter shelf life than the original concentrate — typically weeks — so it’s generally made in batches sized to be used up within that window rather than stockpiled.
What It’s Used For
Activated EM goes into the same range of uses as Effective Microbes generally: composting and bokashi (accelerating breakdown and controlling odor), soil drenches and foliar sprays for plant and root health, and pond or water management to support cleaner water and reduce buildup on surfaces. Dilution ratios and application frequency vary by use case and by supplier — follow the specific product’s instructions rather than a generic ratio.
TerraFerm’s Approach
Rather than selling an effective microorganism product, TerraFerm’s kits provide pre-measured dry and liquid ingredients so you brew your own commercial-grade ASAM batch on-site, alongside separately-sourced EM-style Mother Culture and molasses. See TerraFerm’s ASAM brewing kits for the ingredient sets, or start with What Are Effective Microorganisms for the broader science.
COMMON QUESTIONS
EM1 Effective Microorganisms FAQ
What does “EM1” mean?
EM-1 is the name for a specific commercial formulation of Effective Microorganisms (EM) — the same underlying microbial blend, packaged as one supplier’s concentrated product.
Do I need to activate EM1 before using it?
No, though often EM1 concentrate is diluted and fermented with water and a food source like molasses before field use. Check your specific product’s label, since ratios and timing vary by supplier.
Is TerraFerm’s ASAM the same as EM1?
ASAM is built on the same core Effective Microorganism science as EM1, but it’s TerraFerm’s own kit-based brewing process rather than a commercial product — you brew a batch on-site from pre-measured ingredients rather than purchasing an EM concentrate.
What is EM commonly used for?
Composting, soil and plant applications, and pond or water management are the most common uses. Application method and dilution depend on the specific use case.