Rototilling Your Organic Garden: More Harm Than Good?

The truth is that rototilling does not benefit an organic garden in any way. It exposes weed seeds and damages soil structure, which takes months to reverse.

It’s tough to break our addiction to power tools, isn’t it? Every spring I have to bite my tongue when I hear yet another homeowner talking about rototilling their garden to prepare the vegetable beds for planting. Certain habits are so ingrained in us from an early age that it’s hard to let go.

But rototilling actually does more harm than good to your garden. During a growing season, garden soil creates an intricate web of organisms that support each other as well as your plants. This soil food web, a sort of biosphere beneath your feet, is destroyed or severely damaged by the rototiller.

[su_quote cite=”Jeff Lowenfels, Teaming With MIcrobes” url=”https://www.bigblogofgardening.com/garden-book-review-teaming-with-microbes/”][Rototilling]…breaks up fungal hyphae, decimates worms, and rips and crushes arthropods. It destroys soil structure and eventually saps soil of necessary air…Rototilling is an extreme disturbance to fungi important in growing annuals and vegetables.[/su_quote]

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Why rototilling is bad for your garden

In undisturbed soil, passageways are created by earthworms and other organisms. These tunnels allow air, water, and the essential nutrients they carry to travel through the soil to feed your plants. Once rototilled, these passageways are destroyed. Also destroyed are networks of Mycorrhizal fungi, which form a symbiotic relationship with the roots of your plants, helping one another to thrive. Rototilling also brings weed seeds to the surface that have laid dormant deep in the soil for years. In the subsoil, the weed seeds received no light and insufficient warmth to germinate. Guess what they’ll do now that you’ve created such nice conditions for them?

[su_quote cite=”Ed Smith, The Vegetable Gardener’s Bible” url=”https://www.bigblogofgardening.com/garden-book-review-vegetable-gardeners-bible-ed-smith/”]If you’re starting with a compacted, heavy clay soil containing little organic matter, rototilling will improve conditions a lot. A tiller is a very efficient way to loosen and aerate severely compacted soil and to chop and mix a large dose of organic matter into it. But if you are starting with soil that has decent structure and adequate amounts of organic matter, rototilling can easily destroy the worm-welcoming environment that already exists. This is because the pulverizing action of the tiller breaks up soil aggregates, disrupts capillaries, and demolishes worm-tunnel networks.[/su_quote]

[su_highlight background=”#fff77c” color=”#00010b”]Buy on Amazon: The Vegetable Gardener’s Bible, 2nd Edition.[/su_highlight]

Skip the rototilling and save yourself a lot of work

Once your garden beds are established, save yourself a lot of work and skip the rototilling. You’ll water your garden less because the soil will hold it better, and you’ll need less fertilizer because the established bacteria and fungi will support your plants. You’ll also have fewer weeds because you won’t be bringing long-buried weed seeds to the surface. If you haven’t already, you should consider installing raised garden beds, which will eliminate the need for rototilling or double-digging entirely. The least disturbed soil is the healthiest soil and the most supportive of whatever you plant in it.

So, if you want to create a new flat earth garden bed for spring, start in the fall. Dig the area with a shovel (you could also lay down layers of black and white newspaper and corrugated brown cardboard), add compost and mulch, and let the worms and their friends go to work on it. When it’s time to plant each year, only work the area where you plant your seeds and seedlings and leave the rest of the soil undisturbed.