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Keeping this in consideration, should you put compost around trees?
DO apply compost to trees. Compost won't only help your soil stay healthy–it's also full of microbes that help retain water! Push back the mulch and apply a 2-inch layer of compost under the canopy, making sure to stay clear of the trunk.
Considering this, how do you apply compost to an existing plant?
Rake and till the compost layer into the existing soil around your plants. In order to mix the compost into your existing soil, rake and till the compost into the upper 6 inches (15 cm) of the soil around your plants. This provides aeration and allows the nutrients in the compost to enrich your existing soil.
Some people recommend late fall as a good time to spread compost over a garden bed, and cover it with a winter mulch, such as chopped leaves. By spring, soil organisms will have worked the compost into the soil. Others recommend spreading compost two weeks before planting time in the spring.