A natural lawn with EM: mulching, moss, seeding, and a calendar without chemical fertilizer

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A beautiful lawn without chemical fertilizer or moss killer is entirely possible. The secret isn't a miracle product. It's living soil, well-adjusted mowing, and a little patience. Effective microorganisms can play a part in this approach, provided you know what they can do, and above all what they can't.

Here's how to care for your lawn naturally, season after season, with the EM doses recommended by the manufacturers and the steps that really matter.

Why a lawn wears out

A lawn is a very demanding crop: it gets cut dozens of times a year. When the clippings are bagged every time, nutrients and organic matter leave your yard with each pass. Little by little, the soil becomes poorer, soil life slows down, earthworms become scarce, and the ground compacts.

Other factors often come into play:

• Mowing too short, which weakens the grass and leaves room for moss and rosette-forming plants.
• Foot traffic, especially on wet clay soil, which compacts the ground.
• Thatch: a layer of undecomposed debris on the surface that holds water and smothers the grass.
• Shade from trees or buildings, where grass grows poorly.
• Truly acidic soil, which has to be confirmed with a soil test, not guessed.

Moss and bare patches: what really comes down to the soil

Moss isn't a disease: it's a symptom. It moves in where the grass is weak, and getting rid of it for good means fixing the cause. No product, EM included, will make it go away if the soil stays compacted, waterlogged, or too shady.

The false fixes

• Iron sulfate burns off the moss, but it acidifies the soil: the moss often comes back stronger the following year.
• Lime “just in case”: moss likes acidic soils, but many mossy lawns aren't acidic. Liming without a soil test can make the soil too alkaline for the grass.
• Fast-acting nitrogen fertilizers: they green things up for a few weeks without doing anything about the poor soil.

The real fixes

• Dethatch to remove moss and thatch, then compost the debris.
• Aerate compacted areas with a spading fork or a core aerator.
• Top-dress with fine compost in a thin layer the grass can grow back through.
• Overseed bare patches, with a shade-tolerant mix if needed.
• Mow higher, and only apply lime after a pH test.

Key takeaways

Moss signals a weakened lawn: compacted soil, mowing too short, shade, or a lack of organic matter. You push it back by caring for the soil and adjusting how you mow, not by burning it off.

Preparing to seed or renovate

The best time to seed or renovate a lawn is late summer or early fall, when the ground is still warm and the rain returns. Spring works too, but young seedlings suffer more from summer drought.

1. Work the soil a few inches deep and remove the roots of perennial weeds.
2. Add organic matter: well-aged compost and, if you like, our EM Bokashi Mulch for the soil, at the low rate given by the manufacturer (about 1 lb per 10 sq ft, or 0.5 kg per m²), raked into the top inch or so.
3. Water the soil with EM, diluted 1 to 100 (3.4 fl oz (100 ml) of EM-A Microferm active solution per 2.6-gallon (10-liter) watering can), ideally in damp weather.
4. Wait about two weeks before seeding, as the manufacturer recommends: the fermented material has time to work into the soil, and the first weeds sprout and are easy to pull.
5. Seed, roll or firm lightly, and keep the surface moist until the seedlings come up.

Mowing without bagging: mulching

Mowing without bagging, or mulching, is the single most effective thing you can do for a natural lawn. The mower chops the grass finely and leaves it in place, where it breaks down within a few days and returns to the soil.

• Never cut more than a third of the grass height in one pass. In practice, mow before the grass gets taller than 3.1–3.5 in (8–9 cm).
• Mow when the grass is dry: wet grass sticks together and forms clumps that smother the lawn.
• Mow more often in spring, when the grass grows fast, even if that means mowing every 5 days.
• Keep a mowing height of 2.4–3.1 in (6–8 cm), a little higher in summer and in shade.

Contrary to popular belief, clippings left on the lawn don't cause thatch: they break down quickly. Thatch comes mainly from stems and roots, and from too much fertilizer and watering.

The manufacturer of our EM recommends lightly spraying diluted Microferm on the lawn before mowing, to speed up the breakdown of the clippings. It's a simple, risk-free step, but we haven't found any independent trial measuring its effect on a lawn.

Emy's tip

Raise your mower deck one notch as soon as the first warm days arrive. Taller grass shades the soil, holds moisture better, and leaves less room for moss and dandelions.

Did you know?

Grass clippings contain about 4% nitrogen by dry weight. Trials have shown that leaving clippings on the lawn can cover roughly a quarter of a lawn's fertilizer needs.

Putting bagged clippings to good use

If you prefer to bag your clippings, or the grass is too tall for mulching, don't leave them to rot in a pile. You have three options: spread in a thin 2 in (5 cm) layer around your vegetables, mixed with dry material in your compost bin, or fermented under a tarp with EM. That last method, which lets you handle large volumes all at once, is explained step by step in our guide Speeding up your compost with EM (and making use of grass clippings). Never use clippings from a lawn treated with weed killer.

Feeding your lawn's soil

EM don't feed the grass: they support the breakdown of organic matter. So a natural lawn relies first on mulching and, if needed, a thin top-dressing of fine compost in late winter. Our reference rates for lawns are in the guide Using your compost in the garden. Spreading clover often signals soil low in nitrogen: clover fixes its own, and a lawn with a few flowers is also a lawn that's richer in life.

For watering with EM, the rates are the same as for the garden: diluted 1 to 100, roughly 1–2 quarts of product per 1,000 sq ft (1–2 liters per 100 m²) per year according to the manufacturer, spread over several applications from spring to fall, ideally before rain. On a large lawn, a hose-end dosing sprayer such as our Aquamix set to 1% does the measuring for you. Full details are in our guide Using EM in the vegetable garden.

The manufacturer cites the example of a Swedish golf course that reportedly maintained its greens for three years with a mix of EM, molasses, and an organic nitrogen fertilizer, resulting in more even turf. This is an unpublished account from the manufacturer, and the effect of the EM can't be separated from that of the fertilizer. Take it as a lead, not as proof.

Living soil also attracts earthworms, which aerate the ground and pull organic matter down into it: learn more about their work in our guide the ecological role of earthworms.

The natural lawn calendar

• Late winter, early spring (March–April): dethatch if moss or thatch has taken over, aerate compacted areas, spread a thin layer of fine compost, then do a first watering with EM on moist soil. Overseed bare patches as soon as the ground warms up.
• Spring: start mowing again, mulching, without cutting more than a third of the height.
• Summer: raise the mowing height, mow less often in dry weather, and accept that the grass will brown a little in a drought: it bounces back with the first rain.
• Late summer, early fall (September): this is the best time to renovate or seed. Have the pH tested if you suspect acidic soil, and only apply lime in the fall, if the test calls for it.
• Winter: avoid walking on a frozen or waterlogged lawn.

In summary

A natural lawn rests on three pillars: living, uncompacted soil; high mowing without bagging, never cutting more than a third of the grass; and regular additions of organic matter. Moss is a symptom that retreats when you care for the soil, not when you burn it off with iron sulfate. EM, diluted 1 to 100 on moist soil a few times a year, and bokashi mulch when preparing to seed, can support this approach. Their specific effect on lawns hasn't been independently measured, but they fit safely into soil-friendly lawn care.

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Other topics in the guide

Vermicomposting30 fact sheets →Composting25 fact sheets →Bokashi24 fact sheets →