Knapp Hill rhododendron | Deciduous azaleas are probably the most striking flowering shrubs. Their colours are vivid and bright, and often have the shades that not many rhododendrons can offer. They need full sun. “Arneson Gem” is a true jewel. Its reddish buds open to soft golden-yellow flowers with apricot orange tips and petal margins. It is fragrant and the leaves are disease resistant. Prolific bloomer. ...