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The best time to lay mulch depends on the type of mulch and the reason for installing it: 

• Summer: Adding extra mulch helps soil retain moisture and keeps weeds at bay, allowing plants to thrive. 

• Fall: Adding mulch helps control weeds and keeps soil and roots warm during the cooler months. Aim to add a layer of mulch 2 to 4 inches deep.

• Winter: Mulch around perennial plants to help keep them insulated.

• Spring: Wait until the ground has thawed. Depending on the thickness, add between 1 and 4 inches of mulch to provide freeze and rain protection and enrich the soil.

If you are xeriscaping a lawn from scratch, your best bet for preparing the lawn is to work with a xeriscaping specialist in your area. The most common first step to making the transformation, however, will be to remove the turfgrass from your lawn. The subsequent steps will often include amending the soil to support new plants and installing low-drip or drip irrigation systems.

You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.

Yes, you can put new mulch over old mulch, since it’s decomposable. The only reason you should remove old mulch before laying new mulch would be to maintain a certain aesthetic.