The Blue Royal Empress tree is a very rare and also unique specimen in the flowering trees market.  The Blue Royal Empress tree also known as 'blue paulownia elongata' is a non-invasive flowering tree that produces a spectacular blue flower in the spring that draws a lot of attention from anyone looking. The Blue Royal Empress tree provides a wonderful fragrance to any yard along with the rare contrast of color the tree produces. If you are looking for a very fast growing flowering tree that will provide you with a beautiful color while not taking over your yard AND, be a low maintenance tree to grow-this is the one! (USDA Zones 5-9b)