At the end of the winter season, unpainted seedlings and young trunks, whose bark is not yet covered with a dead cork layer, can get sunburned due to the reflection of sunlight from the snow. In addition, autumn whitewashing protects young trees from mice and voles, which can damage the bark in winter when food supplies are depleted.
Without any particular reason.
However, it makes no sense to whitewash adult trees in spring. Nevertheless, the authorities in many cities continue to carry out this pointless activity. The same is done in other post-Soviet countries, as well as in some African states, where whitewashed trees are considered more attractive.
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