Learning Center / Trees, shrubs and beds
How do you keep weeds out of your mulch beds?
Weed the beds before mulching, keep the mulch at the right depth, get it down early in spring, and pull weeds regularly while they are small. Consistent upkeep beats a big cleanup every time.
- By David Obeid, founder
- Reviewed
- 5 min read
The short answer
Why do weeds keep coming back in mulch beds?
Mostly because of the conditions, not a lack of effort. Disturbed soil, gaps in the mulch, tree cover and seed blowing in from nearby yards keep weed pressure high in Northern Virginia beds.
Lasting control comes from prevention: the right mulch depth and steady upkeep, rather than pulling the same weeds after they have taken over.
What works
What actually keeps bed weeds down?
-
Weed and edge before you mulch
Mulch over weeds just buries them for a few weeks. New mulch should go down on a clean bed.
-
Keep the depth right
Refresh established beds with one to two inches a year, and give brand-new plantings two to three inches, keeping the total around three inches at most. That blocks weed seed without suffocating roots in clay soil.
-
Mulch early in spring
The earlier it goes down, the better it blocks weeds before they get going.
-
Pull weeds while they are small
Small weeds come out roots and all. Regular visits keep beds ahead of weed pressure.
-
Keep mulch off trunks and stems
A donut, not a volcano. Mulch piled against bark invites rot, insects and voles.
Landscape fabric
Does landscape fabric stop weeds?
Not for long under wood mulch. As the mulch breaks down on top of the fabric, it becomes soil, and weeds root right into it. The fabric also makes it harder to add plants and keeps the mulch from improving the soil underneath.
Fabric works better under rock or gravel. For planted beds, the right mulch depth and regular weeding do the job without it.
Tough weeds
What about nutsedge in flower beds?
Nutsedge is hard to pull out completely, because it grows from small tubers underground that sprout again when the top is pulled. It loves wet soil, so improving drainage helps.
Dig it out carefully to get the tubers, or treat it with a product made for nutsedge. How to identify nutsedge and other weeds.
How we handle it
How often should beds be maintained?
Monthly, for most properties. Our landscape maintenance covers bed weeding, pruning and upkeep, starting at $299 a visit. Mulch is double-shredded hardwood, from $397 on its own, and included in the Timesaver and Lifesaver plans.
Related questions
What people also ask
How deep should mulch be?
Refresh established beds with about one to two inches a year, and give brand-new plantings two to three inches. Keep the total layer to roughly three inches at most. Thick mulch over clay keeps roots wet and short of oxygen.
Do you pull weeds and edge the beds before mulching?
Yes. If the beds need it, a bed cleanup or landscape maintenance visit comes before mulch, so beds are weeded and edged and the new mulch goes down on a clean surface.
When is the best time to mulch?
Spring is the most popular time, and the earlier it goes down, the better it blocks weeds before they get going. Many clients also add a fall mulch to keep beds looking sharp.
Keep reading
More from the Learning Center
- What pests and diseases attack trees and shrubs in Northern Virginia? Scale, lace bugs, aphids, bagworms, spider mites, leaf spot, powdery mildew and winter burn: what to look for and when. Trees, shrubs and beds · 6 min read
- When should you prune shrubs and trees? Why timing depends on when a plant blooms, what can be cut any time, and the pruning mistakes most common in local yards. Trees, shrubs and beds · 5 min read
- Why should you mulch your beds in the spring? Spring mulch blocks weeds before they sprout and holds moisture in the soil for the hot summer ahead. How deep, when, and what to avoid. Trees, shrubs and beds · 4 min read
Have a question we didn’t answer?
Ask us. A real person on our team will answer, and if other homeowners are asking it too, we’ll answer it here.
