08/06/2026
A walk through the countryside in Greece often reveals an unusual sight: rows of trees with bright white trunks standing out against the landscape. Many visitors assume the paint is decorative or used to mark property boundaries, but the real reason is far more practical. During the intense Mediterranean summer, temperatures can become extreme, and direct sunlight can heat tree bark to damaging levels. To protect valuable fruit and olive trees, farmers coat the lower trunks with a white lime-based mixture that reflects sunlight away from the bark.
Without this protective layer, dark bark can absorb large amounts of heat throughout the day. The temperature difference between the sunlit side and the shaded side of a tree may become severe enough to cause stress, cracking, and damage to the outer layers of the trunk. These injuries can leave the tree more vulnerable to disease, pests, and reduced productivity. By reflecting sunlight rather than absorbing it, the white coating helps keep the bark cooler and reduces the risk of heat-related damage during the hottest months of the year.
What makes this practice so fascinating is that it relies on a simple, low-cost solution rather than expensive technology. A thin coating applied by hand can help protect trees for an entire season, preserving their health and improving their ability to produce fruit. It is a great example of traditional agricultural knowledge developed through generations of observation. Sometimes, the most effective way to protect a living thing is as simple as changing its color.