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Chickens are attracted to bare patches of ground. If you keep the ground of your garden densely covered but have a separate area of bare ground within view, most chickens will leave the garden behind and gravitate toward the uncovered soil.  Clear a square space roughly 1 yard (91.4 cm) long and 1 yard (91.4 cm) wide. Remove all plant life from that space, including weeds and grass, leaving only the bare soil behind. The chickens will gravitate toward this area. They may scratch and poke around for insects, and they'll often use this space for dust baths. If they have a space dedicated for these purposes, they may not be inclined to do these things elsewhere in your yard. It is also a good idea to sprinkle diatomaceous earth over this patch of ground every few months to keep chicken mites away. If you're trying to repel your own chickens, you might want to consider planting two separate gardens: one for you and one for your chickens. Fill the chicken garden with plenty of appealing and healthy edible plants for your chickens to nibble on.  This trick works best when used in conjunction with other chicken-repelling techniques. Creating a separate chicken garden may not be enough to solve the problem if it is the only thing you do. Your chicken garden should include bushes and low-growing trees that can provide shelter for chickens needing to hide from the sun or from potential predators. Include an evergreen shrub so that the chickens have cover in the winter, as well. Planting edible bushes will be a bonus feature for the chickens. Berry bushes, like elderberry and blueberry bushes, are usually good options. When you're trying to manage your own chickens, the use of edible bushes can also reduce the cost of feeding your chickens.
Keep bare patches away from the garden. Plant a separate garden for the chickens.