How to Make a Worm Bin
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Worms eat kitchen scraps and create worm castings, which are a valuable soil amendment and plant tonic. Though castings are often called fertilizer, they’re actually not very high in nitrogen, but they are full of plant-supporting nutrients.
Sprinkle castings on potted plants and over garden beds. A little goes a long way. A handful can go into the bottom of a planting hole to get a plant off to a good start. Unlike nitrogen-rich fertilizers, worm castings won’t burn the plant’s roots. They can also be mixed with potting soil, in concentrations of up to 20 percent castings, to make an extra-rich growing medium.
Here’s what you should know before you start: A worm bin is a supplement to a compost pile, not a replacement for one. Worms don’t consume indiscriminately the way a compost pile does, and they can only eat so much at a time. But, as we said above, castings are a fantastic resource, so it’s well worth keeping both a worm bin and a compost bin. That said, a worm bin makes a fine green-waste disposal system for an apartment dweller. If you don’t have yard trimmings to worry about, worms can handle a good deal of your day-to-day food waste — such as coffee grounds, wilted lettuce, stale bread and so on — and give you castings in return that you can apply to container plants.
Worm bins are best kept indoors. Worms thrive in temperatures between 50 and 75 degrees Fahrenheit, and those conditions are usually found in the cool parts of a house instead of outdoors. During hot summers, worms dig down deep to keep cool. They can’t do that in a worm bin, which will heat up to ambient summer temperatures. In winter, freezing cold will kill them, too. Of course, it all depends on your climate and situation. If you have cold winters and mild summers, the worms could spend the summer outdoors and the winter indoors. Or in the opposite situation, they could come in for hot summers and stay out for mild winters. You can also take steps to keep the bin’s temperatures reasonable, such as insulating it. Just remember that when temperatures are extreme, worms are unhappy.
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