Impeditum Rhododendron Impeditum Rhododendrons are a species rhododendron with broadly funnel shaped, small flowers, which are violet or purple to rose-lavender, rarely white. Inflorescence up to 4 flowered. Primary Color: Purple Bloom Time: Early Midseason Height in 10 Years: 1' Hardiness (Temperature): -15 Sun / Shade: Morning Sun, Afternoon Shade Landscape Category: Shrub Genus: Rhododendron More plants in: Species Rhododendron Find out if this plant is available: Rhododendron and Azalea Availability List