One of the things I love about here are the twin-lines of plane trees along the roads. It’s such an iconic symbol of France. They have a long and colourful past, but the future isn’t looking so rosy.
A few facts
A brief history will show that there are fossil records of plane trees as early as 115 million years ago. The trees we see all around us here today in the South of france are a hybrid of the Asian and American sycamore trees that were created by accident in Oxford, England in the 16th century. This is why they are sometimes called London Plane trees.
The plane tree is a large, deciduous tree found in the most temperate regions of the Northern Hemisphere growing 30-50 metres tall (100 feet or more). They are popular in cities due to their resistence to diseases and to air pollution. It has proved particularly tolerant of urban conditions, it grows quickly, provides excellent shade, looks beautiful, requires little water, and can be planted in poor soil.
They are characterized by scaling bark, which as the outer bark flakes off, the inner bark shows shades of white, gray, green, and yellow producing a mottled appearance.
Plane trees have both male and female flowers and after being pollinated, the female flowers become a densely packed hard, brown ball about 3cm in diameter that contains several hundred seeds that disperse in the wind rather like a dandelion.
If you are a lover of popping bubble-wrap, then hours of fun are to be had stepping on the fallen ‘seeds’ that give a rather satisfying crunch underfoot as they burst.
The largest plane tree in France (below) is to be found in Saint-Guilhem-le-Désert, a medieval village situated in the valley and gorge of the Gellone and Hérault rivers. It is one of the Plus Beaux Villages de France.
A bit of history
It is thought that Napoleon is responsible for the typical scenes we see today of tree lined roads. It is true that he ordered the extensive planting of plane trees along the roads in Southern France to shade his marching armies from the heat of the midday sun.
But prior to this, it was Pierre-Paul Riquet, a salt tax collector from Béziers, who used plane trees to great effect. He finally solved the problem of how to create a shortcut between the Atlantic and the Mediterranean, avoiding a month long sea voyage, by building the famous Canal du Midi (now a UNESCO world heritage site) which opened to navigation in 1681. He planted more than 250,000 along its length to shade the canal and reduce water evaporation. The roots also serve to stabilise the banks.
However, the plane tree was already in use by Noblemen to create the fine and impressive tree-lined roads leading to their estates.
A deadly hazard?
Today there are perhaps two opposing views of the plane tree: those that love one of the iconic features of the French landscape – the tree-lined country road – and those who view them as a deadly hazard.
According to a survey, nearly one in 10 of the 8,000 road deaths in France each year involves collisions with trees (France has one of the worst road safety records in western Europe). Some departments have begun a systematic policy of felling trees along busy stretches of road. Others feel the real problem is with the drivers themselves and have pointed out that the trees – unlike many French motorists – do not drink too much alcohol, travel too fast or make sudden, unexpected movements.
Unfortunately, in those areas where the roadside trees have been removed, there has been no obvious reduction in the number of road deaths. Cars are still spinning off the road but crashing into other objects instead.
Is the future looking bleak?
Now it seems these poor trees have been hit by a virulent and incurable disease which is killing them. Authorities have been struggling since 2006 to bring it under controle by rooting up and burning thousands of diseased trees in an attempt to stop the fungus spreading.
Because it is highly contagious and can spread through the root system, all other trees within a radius of 50 metres, even if apparently healthy, also have to be destroyed.
Apparently, US troops brought the disease to France when they landed in Marseilles in 1944 with ammunition boxes that were made from infected sycamore wood.
Perhaps the only hope is to develop a new kind of plane tree that will resist this disease? However, the authorities believe their aggressive action should limit the impact and keep these lovely trees lining our roads and canals for the future.