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Generally, it is not necessary to remove old mulch before applying a new layer. As organic mulch breaks down, it enriches the soil with nutrients. However, you should remove the old layer if it shows signs of fungus or disease, which can be common in moist areas, or if the total depth is already too thick. Avoid letting the total mulch depth exceed 3 inches, as this can harm plant roots. If you do remove old, disease-free mulch, it can be added to a compost pile.

Don’t pick up dirt after aerating. Even though it's tempting because soil cores are incredibly unsightly, these cores and the dirt they leave behind are ecologically important. This is what keeps your grass looking beautiful and growing healthily. The soil cores need two to three weeks to decompose, but you can swat them with a rake if their natural shape bothers you.

Typically, the best type to trim bushes is when they’re dormant. Winter and late fall, potentially even early spring are the best times to trim your bushes. These seasons allow you better access to the branches, as all leaves are gone and the branches are more brittle, making the trimming process easier. 

If you have a large number of leftover roots, shrub branches, rocks, and soil to remove from your stump removal project, you may need to call a professional junk removal service. A small truckload of junk removal costs between $75 and $125 to haul away. You may also have a free composting center in your area where you can haul the materials on your own.