HOW DO I PLANT THEM AND WILL THEY GROW IN MISSOURI? HOW FAST DO THEY GROW?
Certified GKH Gardening Expert
They will grow in all areas of your state. The rate of their growth will depend on a combination of genetics, and the care that they receive. It would be hard to give you an exact growth rate. This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm