Learning Center / Trees, shrubs and beds
Why should you mulch your beds in the fall?
Because fall mulch insulates the soil around your plants' roots, protecting them from hard freezes and the freeze-and-thaw swings of a Northern Virginia winter. It also holds in moisture that evergreens need to get through dry winter wind.
- By David Obeid, founder
- Reviewed
- 4 min read
Insulation
How does fall mulch protect plants in winter?
Mulch works like a blanket over the root zone, keeping soil temperature steadier through cold snaps. Roots are far more sensitive to cold than the branches above them, and a layer of mulch softens the hardest freezes.
It also evens out the freeze-and-thaw cycles common here. When bare soil freezes and thaws over and over, it can heave and push shallow-rooted and newly planted shrubs right out of the ground.
Moisture
Why does moisture matter in winter?
Because evergreens keep losing water all winter, even when the ground is frozen and they can't take more in. Drying winds and winter sun pull moisture out of broadleaf evergreens and conifers, which shows up as browned, burned leaves and needles by late winter.
Mulch helps the soil hold onto water going into winter. For evergreens prone to winter burn, our plant health care program adds an anti-desiccant in late fall.
Doing it right
How should fall mulch go down?
-
Clear the leaves first
Clean the beds of fallen leaves so the new mulch goes down on soil, not on a wet mat of leaves.
-
Get the depth right
Refresh established beds with one to two inches. Give brand-new plantings, which need the most protection, two to three inches.
-
Keep it off trunks and stems
Mulch piled against bark gives voles a sheltered place to chew on trunks and stems over winter. Leave a gap.
-
Don't overdo it
Keep the total layer to about three inches. Thick mulch over clay keeps roots wet and short of oxygen.
The bonus
Does fall mulch help the beds look better too?
Yes. Fresh mulch keeps beds looking sharp through the holidays and the winter months, when the rest of the yard is bare. Many of our clients add a fall mulch for exactly that reason.
Mulch installation starts at $397 on its own, and pairs well with fall leaf cleanup. Here is why spring mulch matters too.
Related questions
What people also ask
When should fall mulch go down?
After most of the leaves are cleared from the beds and before the ground freezes, so the mulch goes down on clean soil and is in place before the coldest weather.
How deep should fall mulch be?
About one to two inches to refresh established beds, and two to three inches for brand-new plantings. Keep the total layer to about three inches.
Should I mulch in spring and fall?
Many clients do: spring mulch for weed control and summer moisture, fall mulch to protect plants through winter. Using a thinner layer each time keeps the total depth healthy.
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
- How do you keep weeds out of your mulch beds? Why bed weeds keep coming back, how deep mulch should be, what landscape fabric really does, and the routine that works. Trees, shrubs and beds · 5 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.
