In the Gastern valley exists a high diversity of the flora, including rare species legally protected at federal or cantonal level. Among them two species of orchids that can be discovered with some luck directly on the edge of the path: the lady's-slipper and the spotted orchid. The lady's-slipper is a so called pouch trap flower and its yellow part is particularly striking: the insects are attracted by the yellow color and fall into the slipper-shaped pouches.
On the way out the insects collect pollinia which they deposit during the visit of the next flower, thus fertilizing it. The lady's-slipper orchid prefers moist soils over limestone and dolomite rock.