Landscape Plants of the Upper Midwest

Rhododendron (see Info)

Plant Information

  • Plant Type: Medium Evergreen
  • Scientific Name: Rhododendron species and hybrids Play audio of plant name
  • Family: Rhododendron
  • Related Cultivars:

    Rhododendron catawbiense 'Roseum Elegans'
    Rhododendron x 'Aglo'
    Rhododendron x 'Anna H. Hall'
    Rhododendron x 'Boule de Neige'
    Rhododendron x 'P.J.M.'

  • Zone: Dependant on Cultivar
  • Plant Size: dependent on cultivar
  • Bloom Time: Spring
  • Habit: Rounded
  • Culture:

    Rhododendrons in bloom are among the most striking and beautiful of all plants. They are however, fastidious about their cultural requirements: 1

  • Notes:

    Attractive broadleaf evergreen plants with spectacular spring blooms. The American Rhododendron Society rates the hardiness of rhododendrons on a scale of H-1 to H-5, with H-1 denoting a plant hardy to -25 F, H-2 hardy to -15 F, etc. Gardeners in the upper Midwest should only consider cultivars listed as H-1. Dead-heading (removing the spent flower heads shortly after blooming), is important to eliminate seed production which causes reduced flowering. There are literally thousands of Rhododendron species and cultivars. Presented here is an overview of some of the more common hardy species and cultivars.

  • Rhododendrons :

    Rhododendrons are commonly divided into two general groups: 1. Azaleas, which are mainly deciduous with funnel-shaped flowers contained 5 stamens 2. Rhododendrons, which are mainly evergreen with bell-shaped flowers containing 10 or more stamens.

  • Pruning:Pruning animation

    Heading back is done to shape and reduce the size of the plant. Cut prominent shoots back inside the body of the plant to where they meet another branch.

    Heading back may be done from late fall to mid-July.

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Landscape Plants of the Upper Midwest

Bill Hoch, Associate Professor
Montana State University

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