2. Apply the Correct Mulch Depth

One of the most common mulching mistakes is applying too thick of a layer. Mulch that’s too deep can trap excess moisture, creating a breeding ground for root rot pathogens. Here’s how to get the depth right:

• Aim for 2-4 Inches of Mulch: A layer between 2 to 4 inches deep provides effective moisture retention without suffocating roots.
• Check Regularly for Build-Up: Over time, organic mulch decomposes and can accumulate, leading to excessive thickness. Check the mulch depth each season and remove any excess to keep it at an optimal level.

3. Avoid Volcano Mulching

Volcano mulching is a term used to describe when mulch is piled high against a tree’s trunk, forming a cone shape. This practice traps moisture around the base of the tree and can cause several issues, including root rot.

• Keep Mulch Away from the Trunk: Leave a 3 to 6-inch gap between the mulch and the tree’s trunk. This space allows air circulation around the root collar and prevents moisture buildup.
• Mulch in a Ring Shape: Instead of piling mulch directly against the trunk, spread it in a flat, even ring around the tree, covering the area up to the drip line (the edge of the tree’s canopy). This protects roots without exposing the trunk to rot risk.

4. Avoid Frequent Overwatering

While Southwest Missouri experiences rainy seasons, it’s still essential to monitor how much water your trees receive. Overwatering, combined with improper mulching, can exacerbate the risk of root rot.

• Water Deeply but Infrequently: Water deeply to encourage roots to grow downwards, but avoid frequent watering, which keeps the soil too wet. After a rainstorm, check to ensure the soil isn’t overly saturated.
• Let the Mulch Dry Between Watering: Organic mulch can retain a lot of moisture, which is helpful in dry conditions but can be problematic during rainy periods. If your mulch feels damp for days, avoid watering until it has dried out to reduce rot risk.