Yellow Rhododendron "althea" the Petite Knock Out® Rose

the Petite Knock Out® Rose Shrub gives you the best of both worlds: True red blooms on a small form and the carefree Knock Out® benefits you love

unique variation through the toughest climates and conditions

But despite their size

Don’t wait – this unique plant is in high demand

Through our proven process

Yellow Rhododendron "althea" the Petite Knock Out® RoseHeat Tolerant Shrub + Giant Yellow Blooms Why Yellow Rhododendrons? This extremely heat tolerant Rhododendron boasts huge yellow blooms in the spring growing where no rhododendron has ever grown before. In fact, this variety thrives in direct sunlight or partial shade. Popular for its huge clusters of vibrant yellow flowers (in clusters of 8 to 10 flowers each), the Yellow Rhododendron will have your neighbors and guests wondering where you got your