weeds growing on top of mulch

Weeds growing on top of mulch

One of the benefits of mulch is that it prevents weeds from growing in the first place. If weeds are piercing through your mulch-bed, it may be the case that you are using a cheaper or low-quality mulch. These are typically made with grass clippings, straw, or leaves as opposed to wood chips, bark nuggets, and sawdust

Want to ensure your mulch bed is installed properly? Leave it up to the experts at Voss Landscaping & Tree to ensure your mulch is giving your trees and shrubs the most benefit. Our expert landscapers offer a wide array of landscaping services and will always apply the highest quality mulch!

Purchase High-Quality Mulch

In Columbia, Missouri Voss Landscaping uses and suggests triple-shredded hardwood mulch to prevent weeds from growing. Higher quality mulch typically contains larger materials and chunks in it. If used liberally, about three inches deep, your high-quality mulch should prevent any future weeds from surfacing.

There are several reasons why weeds may be breaking through your mulch bedding. Follow our tips below to discover the reasons why and the best ways to prevent them from showing up again in the future!

Use Landscaping Fabric

Another sure-fire way to prevent weeds when planting your bed is to employ the use of a landscaping fabric. Landscaping fabric is a thin textile you can purchase at most local garden stores and is designed to prevent the growth of weeds by blocking sunlight to them.

Weeds growing on top of mulch

To stop weeds in mulch with pre-emergent herbicides, begin by raking mulch off to the side, then hoe or pull any existing weeds. Apply the product, following manufacturer directions to the letter. Pay attention to the label, as some plants don’t tolerate certain types of pre-emergent herbicides.

Sometimes, good old hand-pulling is still the most effective way of getting rid of weed growth in mulch.

Manual Mulch Weed Control

When used correctly before weeds sprout in early spring, pre-emergent herbicides are one effective way to prevent weeds coming up in mulch. They won’t, however, do anything for weeds that have already sprouted.

Mulch acts as physical barrier against weeds, but it must block sunlight in order to be effective. If you notice weeds coming up in mulch, you may need to thicken the layer as blocking light generally requires at least 2 to 3 inches (5-7.6 cm.). Replenish mulch as it decomposes or blows away.

How to Kill Weeds in Mulch with Herbicides

A Note about Glyphosate: You can use glyphosate to stop weeds in mulch, but this approach requires extreme care because glyphosate, a broad-spectrum herbicide, will kill any broad-leaved plant it touches, including your favorite perennials or shrubs. Apply glyphosate directly to weeds, using a paintbrush. Be extremely careful not to touch nearby plants. You can also protect plants by covering them with a cardboard box while you’re applying the herbicide. Don’t remove the box until the treated weeds have time to dry completely.