Rhododendron plant named ‘UMNAZ633’

Abstract

A new cultivar of hybrid Rhododendron plant named ‘UMNAZ633’ that is characterized by its rounded plant form with compactly branched plant habit; reaching 1 m in height and width after 15 years of growth, its abundance of flowers that are red in color in mid to late May in Excelsior, Minn. with the red color retained throughout the bloom period without substantial fading prior to abscission, its good cold hardiness with flower buds that are resistant to cold damage and consistently bloom even when exposed to temperatures as low as −25°, and its foliage with relatively good tolerance to powdery mildew.

It is claimed: 
     
       1. A new and distinct cultivar of  Rhododendron  plant named ‘UMNAZ633’ as herein illustrated and described.