The arrival of spring is synonymous with happiness for most, but not for those suffering from allergies. Pollinariums - gardens where the trees, bushes and grasses that cause pollen allergies are planted - have been set up in several French cities, including Rennes, to help sufferers. The idea is to cultivate the most typical plants from the area and to monitor when the various pollens spread in order to warn those most sensitive. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES