Why whitewash trees?
The main goal of whitewashing is to protect the bark from extreme temperature fluctuations, especially in winter and early spring. On sunny days, the trunk heats up, then cools rapidly at night – this can cause so-called frost cracks and bark damage. Such injuries weaken the tree and create entry points for fungal and bacterial diseases.
The white layer of lime reflects sunlight effectively, reducing bark heating during the day and protecting it from thermal stress. As a result, the tree overwinters in better condition and starts the new growing season more easily.
When to whitewash?
Ideally, trees should be whitewashed by the end of January. The treatment can also be done in February, and if rain washes off the lime, it’s worth repeating until the end of February or early March. Whitewashing in spring is much less effective.
What to use for whitewashing?
Ready-made products, such as lime-based tree paints, are best. Lime forms a durable protective layer on the trunk, safeguarding the tree throughout winter and early spring. This also eliminates the risk of incorrect proportions that can occur when mixing solutions manually.
How to whitewash properly?
Apply the lime with a brush to the entire trunk – from the base up to the first branches – paying special attention to the south-facing side, which receives the most sun. Perform the treatment on a dry, rain-free day with temperatures above freezing.
Which trees to whitewash?
Fruit trees such as apple, pear, plum, cherry, and apricot trees are most commonly whitewashed. The treatment is especially recommended for young trees, whose bark is thin and more vulnerable to frost and sun damage.
