Rhododendron Madame Masson

This is a rhododendron that is tucked into my back border. It has too much shade and too much competition from the big Norway maple. I keep wondering if I should move it a bit.

I looked up the variety. It is this one. Description: Beautiful old hybrid, dating from 1849. Forms an open upright shrub. Unusual almost flat flowers, white with a large yellow blotch, are produced in tall conical trusses. Highly recommended for cold gardens. Parentage: catawbiense x ponticum. Utimate Height: 3.0 meters after 10 years