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Compost Directly in Your Garden with an Earthworm Composting Tower

By Edited Sep 8, 2015 1 1

Build your own Self Spreading Composting System

Earthworm Composting Tower in Garden
This article will teach you how to build an earthworm composting tower that will allow you to compost your veggie food scraps directly in your vegetable or flower garden. The finished nutrient-rich compost seeps into the surrounding soil and is spread around your garden by the natural work of nightcrawlers and other earthworms.


Usually when people talk about worm composting they are referring to vermicomposting which is a form of composting in which you feed your vegetable food scraps to a specific type of earthworm called red wigglers (scientific name: Eisenia Fetida). Vermicomposting can be done indoors or outdoors and usually requires some sort of container or bin. If you would like to learn more about vermicomposting, please read: Getting started with Worm Composting and How to Build a Worm Bin

In this article, you will learn how to use earthworms in your garden to compost right where you want the finished compost to be. The major benefit to this composting technique is that once it is set up, you don’t have to do anything but continue to add food scraps in small amounts. No turning the pile like you have to do in Hot Compost Pile Composting, and no separating the worms from the castings like you have to do in a vermicomposting bin.

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The earthworm composting tower is a self spreading composting system. It 
Earthworm Composting Tower with open top
relies on the natural ability of nightcrawler earthworms to tunnel around in your garden soil eating organic material (kitchen food scraps) and depositing castings (worm poop) throughout your garden. The worm castings are very high in nutrient value and act as an organic fertilizer for any plants that you are trying to grow.

How to Build an Earthworm Composting Tower for your Garden
  • Build a tower roughly 2 feet tall. In the photos, you can see that I built mine out of wood in a rectangle shape. You can also use a very large diameter PVC pipe. The PVC pipe version is easier and you can purchase a lid that fits exactly the pipe’s diameter.
  • Drill many ½ inch (or so) holes in the bottom 6 inches of the pipe or the wooden composting tower. This bottom portion will eventually be buried under ground 
    Electric Drill
    and will allow hungry nightcrawlers and other earthworms to enter the composting tower, eat some veggie food scraps, and then leave to spread the castings in the rest of your garden. There is no magic number for amount of holes. Drill enough to make it easy on the worms but not too many that the pipe or tower won’t stand up.
  • Bury the composting tower directly in your garden. Bury the tower eight inches deep so that dirt covers all of the holes. Worms will go in and out the open bottom of the tower and the holes you drilled. I have had success placing the tower very close to my vegetable plants. The vegetables or flowers you are growing will benefit from the added nutrients in the worm castings.
  • Fill the composting tower with vegetable food scraps from your kitchen. Be sure not to put meat or bones in as those take much longer to decompose and can attract pests. You can fill your tower all the way to the top or start by filling it half way and see how long it takes the worms in your garden to eat it. 
    Leaf Composting
    Put a handful of leaves or other brown carbon compost material on top of the food scraps to deter other bugs. When the level of food scraps drops, simply add more. You will be amazed how fast the food scraps in your tower disappear!
  • Add a lid or top to your composting tower. I made one out of wood for my composting tower but if you are building your tower out of PVC pipe you can simply buy a lid that fits perfectly.
  • Add Earthworms to your tower. This step is optional. The earthworms in your garden will find the food scraps on their own but if you want to kickstart the process you can always go to a local hardware or bait/tackle store and buy some nightcrawlers to put in.
  • Build More! Depending on your garden’s size, you can build several of these around your garden. The more you put in your garden, the more beneficial nutrients you are adding to your soil.
Have fun building your earthworm composting tower and composting your vegetable kitchen scraps directly in your flower or vegetable garden.
 
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Check out these other great articles:
 
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Worm Composting for Kids
 
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