Rhododendron, Blue Baron RhododendronBlue Baron Rhododendron is a slow growing evergreen shrub with an upright habit and small dark green foliage. Clusters of deep blue flowers bloom in mid spring. A very versatile plant that prefers morning or partial sun with acidic rich, well drained soils. Type: Shrub Height: 3 4 Spread: 2 3 Spacing: 2 USDA Hardiness Zone: 5 8 Culture: Part Sun Bloom Color: Blue Season of Interest: Spring, Year Round MAINTENANCE NEEDS: A low maintenance plant.