Rhododendrons

‘Great Eastern’ Photo by Dorothy Knippenberg ‘Laurel Pink’ Photo by Dorothy Knippenberg ‘Paul Vossberg’ Photo by Joe Di Giacomo Dorothy Knippenberg began hybridizing rhododendrons in 1955 at Laurelwood Gardens, and

Laurelwood Arboretum is the home of 20 rhododendrons hybridized by Allan and Shirley Anderson, a retired chemist and science teacher respectively, who gardened and raised rhododendrons at their home in

Our rhododendron propagation team has successfully rooted several stem cuttings taken from R. ‘County of York’ in the arboretum last September. The stem cuttings were placed in a rooting box,

One of the earliest blooming rhododendrons in Laurelwood Arboretum is ‘Cornell Pink’ which is known as a truly pink form of R. mucronulatum. The species R. mucronulatum has flowers that

The name Rhododendron comes from the Greek words “rodon” which means “rose” and “dendron” which means “tree”, hence Rose Tree. There may be no better example of a “Rhododendron Tree”

Have you ever wondered why the leaves of your rhododendrons curl up in very cold weather? You may observe that the leaves on your plants are drooping down and curling

Known for its clusters of violet trumpet-shaped flowers, R. ‘Blue Peter’ is one of the classic American “Iron Clads” meaning it is cold hardy. It has been used in the

Joseph Di Giacomo, Master Gardener and chairperson of the Friends of Laurelwood Arboretum Rhododendron Study Team, will share information about the legacy of John and Dorothy Knippenberg and the development

Newly planted R. ‘Cynthia’ on Ridge Road in the arboretum was blooming in July although its recorded blooming period is Midseason from approximately the first week to the second week

Ever wonder the best time to see the most rhododendrons in bloom in Laurelwood Arboretum? The answer is: Now. The rhododendron collection in Laurelwood Arboretum includes more than 400 named

The name Rhododendron comes from the Greek words “rodon” which means “rose” and “dendron” which means “tree”, hence Rose Tree.

The Laurelwood Arboretum Board of Directors has named its newly completed propagation greenhouse the “Dorothy Knippenberg Propagation Greenhouse” in recognition of Dorothy’s lifetime dedication to the hybridization of rhododendrons, azaleas, and other plants.