The brilliant yellow tropical waterlily Nymphaea ‘St. Louis Gold’ is lighting up the propagation greenhouse at Denver Botanic Gardens. Possibly the brightest yellow waterlily of all, ‘St. Louis Gold’ was hybridized by the legendary Dr. George H. Pring. With ample light and water temperatures above 70 degrees, tropical waterlilies can flower even during the winter months, adding fragrance and excitement to your home or greenhouse.