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
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?
It's easy to do, too, requiring no special skill and only six common household items:
- a 2-gallon bucket
- 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!
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.
How to Clean Smooth Bark
Cold, soapy water and a light scrubbing is usually enough to remove most deposits on smooth-barked trees.
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
Chinese or Lacebark Elm
Chinese Paper Birch
Betula nigra 'Heritage'
Japanese Red Pine
Sycamores or Plane Trees
This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.
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© 2012 Jill Spencer