Tourbillon Castle and Valère Basilica, Sion
Sion and its two castles, Valère and Tourbillon, as well as Montorge hill, are areas rich in biodiversity. The climate is dry, with an average annual rainfall of 590 mm. By comparison, Marseille receives 602 mm! This sunny, warm climate in summer and cold climate in winter allows a whole range of flora typical of rocky areas and steppes to flourish. Formerly used for grazing, the two hills are now protected and have been listed in the Federal Inventory of Landscapes of National Importance since 1977.
Looking to your left from the starting point of the Tourbillon trail, you will see several large Opuntia scheerii cacti. They are accessible on foot. Be careful of falling rocks when approaching them, and be mindful of the residents of the house below. There used to be other species along the trail, but they have been removed.
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When the buds open, the flowers are salmon-colored, then turn yellow a week later. During the summer months, you may also see a few small wasp nests directly on the snowshoes.
As you continue climbing, take the opportunity to observe the numerous Sempervivum plants. Where Sempervivum grows, Opuntia can also be found. These two species share the same preferences in terms of soil and exposure.
Before and after the first gate, there used to be a few Opuntia phaeacantha plants, which you can see in the photo below. Finally, you will reach the 13th-century Tourbillon Castle, which was the residence of the Bishop of Sion until it was destroyed by fire in 1788. Take a moment to admire the magnificent view of Valère and the surrounding area. It is possible to visit the castle during opening hours. Inside, there is an Opuntia scherrii.
Around this basilica is a very large area populated by Opuntia humifusa. Several Opuntia phaeacantha are also visible, as well as other Opuntia sp. Take the time to explore the Basilica of Valère before heading back down to the town of Sion.
