Endeavor Tropcal Water Canna This tropical marginal plant boasts green foliage with brilliant red flowers. One of the few true water loving cannas, along with the other Longwood canna hybrids, this is an excellent variety for the pond. Canna glauca 'Endeavor' is an eye catching water garden plant from quite a distance. Great for use as a background plant where taller growth is necessary. Red flowers can be seen all summer long.