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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.

In general, you can prune up to one third of the height of most shrubs without damaging them. There are a few exceptions to this rule: Pine shrubs, for example, can’t be trimmed below the point of new growth without damaging them.

It’s possible to over-mulch leaves. If the leaf mulch is thick enough that it’s blocking and smothering the grass, that’s a problem. Ideally, you should still be able to see the grass when you’re done mulching to ensure its ability to continue growing. The solution is to make another pass at the top layer of leaf mulch to collect some of the top layer.

An herbicide with glyphosate, imazapyr, or triclopyr kills ivy the fastest. Herbicides inhibit photosynthesis and cell division. They kill the roots and prevent ivy from regrowing. You should apply herbicide to the cut stems and roots of ivy. You can also spray herbicide on the leaves of ivy, but be sure not to spray nearby trees and plants as it can cause them harm.