Why You Should Know About Sheet Mulching

 

Sheet mulching. Also, sometimes called “lasagne gardening” or “composting in place.”

There are few garden practices I would call life-changing, but this one most certainly is.

First of all, what is it?

Sheet mulching is the practice of layering organic material onto the surface of the ground, rather than digging up or tilling.

It is an especially good idea for any area where you would like a new bed: for instance, turn an area of weeds or sod into rich soil for planting without ever picking up your shovel or an herbicide.

How do you do it?

Easy.

  1. Cover your area with a single layer of ordinary, brown cardboard (plastic tape removed) or a thick layer of regular (non glossy) newspaper. Wet well with a garden hose.
  2. Add at least six inches (a foot would be even better) of organic material on top of the cardboard or newspaper. I love to use mushroom mulch (a rich by-product of mushroom farming), but you could use shredded bark, chopped leaves, straw (not hay), compost, or composted manure. Woody toppings will take the longest to break down.
  3. Time. Follow those two steps in the fall, and you will have a bed ready for planting in spring. But feel free to do it at any time. You’ll know when the bed is ready: over time, the cardboard or newspaper will break down, but not before the grass and weeds underneath have died and decayed and fed the soil.

Why does it work?

Sheet mulching mimics nature by building soil from the top down. Picture a forest: why is the soil beneath the trees such rich hummus? Because year after year, the leaves fall, decay, and–top down–the soil grows richer.

THAT is the power of sheet mulching.

Skills

Posted on

April 14, 2020

2 Comments

  1. Erin Thiele

    Would this work on clay-like soil, or really nutrient deprived ground? And what about it being washed away with rains – how to prevent that?

    Reply
    • Christie Purifoy

      Great questions, Erin. This works VERY well on clay soil and nutrient deprived ground. An additional option for very poor soil is to add some amendments–such as bone and blood meal–onto the ground before layering your cardboard on top. If you are working in an area where you are concerned about everything washing away (perhaps on a slope), you can first pin down the cardboard/newspaper with metal pins or stakes. If the organic material you pile on top is heavy enough (and most will be), it shouldn’t wash away.

      Reply

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