Nhĩ cán tím or Rong ly tím (Lentibulariaceae) flowers from the lunar January to March. They are abundant in Tram Chim National Park. During the blossom season, the canals in the area turn purple, the green area is embellished with purple pieces. In some years, the 1-km section of canal is full of purple flowers. It is a great chance for tourists to enjoy the beauty of Lentibulariaceae Purple flowers in Tram Chim National Park.
The boat route to the area with these flowers is not popular at any other time of the year. They usually design a special tour on which tourists can see delicate purple flowers in Tram Chim National Park. The tour usually lasts 4 hours, include seeing Tram Chim and the seasonal flowers.