While spring and summer have long been the go-to seasons for spreading mulch, more homeowners are now opting for a fall application. This shift is often due to pleasant autumn weather and a good supply of shredded hardwood mulch available at local stores.
When done right, fall mulching can support plant health, but many people are using too much mulch. Piling it too high, especially around trees, can be detrimental. Mulch should only be about two to four inches deep, regardless of what you’re planting. Unfortunately, we often see “volcano mulching” where the material is stacked in cones around tree trunks, sometimes exceeding 18 inches.
Applying too much mulch wastes money and can harm your plants in several ways:
Root Dehydration: Thick mulch can become compacted, limiting oxygen for the roots. Trees might grow secondary roots into the mulch, which can later dry out as the mulch decomposes.
Root Girdling: Roots that grow in circles around the tree trunk can strangle it as they expand. This restricts water and nutrient flow, which can eventually kill the tree.
Bark Damage: When mulch is piled against the bark, it can rot, leaving the tree vulnerable to pests and diseases.
Water Infiltration Issues: As mulch breaks down, it can repel water, leading to dry roots.
Tree Stress: The cumulative effects of too much mulch can weaken trees, making them susceptible to pests and diseases.
To keep your plants thriving, follow these simple tips for applying mulch in the fall:
Limit mulch to a maximum of four inches deep. If you’re adding to existing mulch, remove some older material first.
Avoid piling mulch against the bark of trees and shrubs. Leave at least a two-inch gap.
If using a weed barrier, make sure it’s breathable. Opt for landscape fabric over plastic, which doesn’t let moisture through.
As autumn mulching becomes more popular, remember to apply these best practices. Whether you’re doing it yourself or hiring a landscaper, sharing this knowledge can help ensure your plants stay healthy.
For a more comprehensive understanding of proper mulching practices, check out this detailed guide from Ohio State University Extension.
In essence, a little mulch goes a long way. Spend some time on your plants this fall, but remember, moderation is key!
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perennial plants, hardwood mulch, organic mulches
