Switzerland. Canton Ticino. Lugano. Traffic signs. White arrows on black asphalt road. Flowers decoration. Allium is one of the purple spring flowers that appear in May. The flower umbels are between 8 and 10 cm in diameter. They are made up of hundreds of dark purple flowers perched at the top of the stem, which measures between 80 cm and 1 meter. 17.05.2020 © 2020 Didier Ruef