Garden towers are an easy and fun way of growing food in limited space, while composting your food scraps and using them to fertilize the soil. The idea is that the plans are put in special slots cut on the side of the barrel, while food scraps are put in the perforated tube mounted inside the barrel. Then a couple of earthworms are also inserted in the tube and while they munch their way through the food scraps, they also fertilize and constantly improve the soil in the barrel.
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