The Honourable Jean Marie de Montague Rhododendron The Honourable Jean Marie de Montague Rhododendron is the most popular and well known red bloomer for the Northwest. Abundant ball-shaped trusses of stunning red flowers. Rounded growth habit. Primary Color: Red Bloom Time: Late May Height in 10 Years: 4' Hardiness (Temperature): -5 Sun / Shade: Morning Sun, Afternoon Shade Landscape Category: Shrub Genus: Rhododendron More plants in: Hybrid Rhododendrons Find out if this plant is available: Rhododendron and Azalea Availability List