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How to Clean Tree Bark

Pollution, fungal spores, mildew, dirt, insect eggs—all sorts of deposits can lessen the appeal of beautifully barked trees and potentially harm them. Washing specimen trees like lacebark elm, Kousa dogwood and sycamore is a simple task any gardener can do any time of year, even in autumn and during the mild days of winter.

Clean, Healthy, Beautiful Bark

As cinnamon-bark crape myrtle ages, its rough bark peels away to reveal the smooth, rusty- red bark beneath.
As cinnamon-bark crape myrtle ages, its rough bark peels away to reveal the smooth, rusty- red bark beneath. | Source

The rusty-red, cinnamon-bark crape myrtle; the elegant, ghostly birch; the crinkly-skinned snake-bark maple—some trees have absolutely stunning bark.

If you have beautifully barked trees in your yard, washing them will not only enhance their beauty, but it will also facilitate their health, cleaning away fungal spores and insect eggs, and helping to ensure that your trees live a long, long time.

Tree washing takes little time (anywhere from 30 to 40 minutes, depending upon the size and dirtiness of the tree).

Do you have a specimen tree in your yard?

See results

It's easy to do, too, requiring no special skill and only six common household items:

  • a 2-gallon bucket
  • water
  • tablespoon
  • mild liquid soap
  • scrub brush
  • soft cloth

Specimen trees are notable for their size, rarity and/or exceptional beauty. Ordinarily, they're grown singly in a prominent location that showcases their uniqueness.

Washing Trees with Rough Bark

To dislodge deposits from the crevices of rough tree bark, you'll need cold water as well as a bucket full of hot, soapy water—and lots of elbow grease!

European Birch Bark
European Birch Bark | Source

Loosen Bark Deposits

Before you start washing the tree, spray water over the trunk or spray it down with a hose to loosen and soften any deposits of dirt, pollution, insect eggs, fungal spores, etc.

Mix the Wash Water

Next, mix up the washing solution.

Add one tablespoon of mild dish washing liquid or other soft soap to two gallons of hot (not boiling) water.

Although the soap solution is mild, it's strong enough to weaken the protective coating on insect eggs. Once that coating it breached, the eggs will either die due to frost or dry out in the sun and wind.

Scrub the Bark

Use a scrub brush to apply the hot soapy water to the bark, working from the top down.

Scrub hard to dislodge deposits, then repeat the process.

Rinse the Soap

After scrubbing twice, rinse the area with cold water, either by throwing bucketfuls onto the trunk or spraying it with a garden hose.

Dry and Buff

Once it's free of soap, allow the bark to dry. Then buff it with a soft cloth and watch it glisten in the sun.

Source

How to Clean Smooth Bark

Cold, soapy water and a light scrubbing is usually enough to remove most deposits on smooth-barked trees.

Soften Deposits

Begin the cleaning process by by spraying the tree trunk with cold water. This will loosen and soften deposits on the bark.

Mix the Washing Solution

Mix the washing solution by adding one tablespoon of mild liquid soap to two gallons of cold water.

As noted above, although the soap solution is mild, it's strong enough to weaken the protective coating on insect eggs.

Scrub the Bark Lightly

Apply the soap solution to the bark with a scrub brush. Scrub lightly, working from top to bottom.

Rinse and Buff

Rinse the trunk with cold water and allow to dry before buffing.

Trees with Beautiful Bark

Common Name
Scientific Name
Chinese or Lacebark Elm
Ulmus parvifolia
Chinese Paper Birch
Betula albo-sinensis
Chinese Zelkova
Zelkova sinica
Crape Myrtle
Lagerstroemia spp.
Flowering Cherries
Prunus spp.
Heritage Birch
Betula nigra 'Heritage'
Japanese Red Pine
Pinus densiflora
Kousa Dogwood
Cornus kousa
Lacebark Pine
Pinus bungeana
Paperbark Cherry
Prunus serrrula
Paperbark Maple
Acer griseum
River Birch
Betula nigra
Stewartia
Stewartia spp.
Striped Maple
Acer capillipes
Sycamores or Plane Trees
Platanus spp.
State Fair Zinnia
State Fair Zinnia | Source

© 2012 Jill

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Comments 10 comments

The Dirt Farmer profile image

The Dirt Farmer 2 years ago from United States Author

Yeah, it does sound sort of crazy, but washing the bark is a good idea for those expensive specimen trees in your yard. Thanks for dropping by! --Jill


KL Klein profile image

KL Klein 2 years ago from California

I never, ever would have thought of washing tree bark, but it makes sense! Great hub.


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Thanks, Maren! Nice to hear from you. (: --Jill


Maren Morgan M-T profile image

Maren Morgan M-T 4 years ago from Pennsylvania

You always give us great information!


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Like anything else, trees can become dirty. Our cinnamon bark crapemyrtle tends to get mildew, which lessens its vivid color. Scrubbing it takes the ick right off. Glad the hub is useful to you--and always happy to hear from you. Take care, Jill (:


Glimmer Twin Fan profile image

Glimmer Twin Fan 4 years ago

Jill - Never thought about cleaning our tree bark. We do have a couple of specimen trees. One in particular could use it. Cool hub!


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

GoodLady--I love the texture and colors of both bark and rocks. I've been trying to take decent photos of them but haven't quite figured out how to capture them so that they appear as beautiful as they seem to me. Glad to hear from you! --Jill


GoodLady profile image

GoodLady 4 years ago from Rome, Italy

What a beautiful idea, though I won't be washing mine I don't think. I have a fig tree that looks pretty clean and a small olive tree...and all the oaks in the driveway are really wild - but I do love bark and I do love looking at the bark of trees. In fact when I drive home I spend most of my time loving the bark...we have a lot of cork trees here!


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Weird, huh? But ... a very doable part of yard maintenance if you have one or two specimen trees. Have a good one! Jill


OldRoses profile image

OldRoses 4 years ago from Franklin Park, NJ

Fascinating! I've never heard of washing tree bark on a growing tree. I love your list of trees with interesting bark.

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