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Seasonal care for trees & shrubs: pruning evergreens

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Removal of weak, diseased, or broken branches, along with double leaders or dead evergreen branches can be done at any time with little consequence to tree health. “Conifers may be pruned any time of year, but pruning during the dormant season may minimize sap and resin flow from cut branches” (Bedker et al., 1996).

Learn more about pruning in How to Prune Trees

The following lists are of conifer diseases affecting certain conifer plants. Pruning of these plants should NOT be done during WARM, WET periods of the year (i.e. spring into summer)

Species affected by Rhizosphaera Needle Cast
Blue spruce (Picea pungens)

Species affected by Diplodia (aka. Sphaeropsis Shoot Blight & Canker)
Scots pine (Pinus sylvestris)
Red pine (Pinus resinosa)
Ponderosa pine (Pinus ponderosa)
Austrian pine (Pinus nigra)
Mugo pine (Pinus mugo)

Species affected by Cytospora Canker
Blue spruce (Picea pungens)
White pruce (Picea glauca)
Black hills spruce (Picea glauca var. densata)
Norway spruce (Picea abies)
Engelmann spruce (Picea engelmanni)

More information on each step:

Authored by Rebecca Koetter, Gary R. Johnson, and Dave Hanson: University of Minnesota
Funded in part by USDA Forest Service: Northeastern Area
Chart designed by Andrew Rose: www.handeye.us

Download & print your own poster or magnet copy of the “Seasonal Care for Trees and Shrubs in Northern U.S. Climates”

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2 Responses to “Seasonal care for trees & shrubs: pruning evergreens”

  1. David Conradi-Jones says:

    I haven’t seen any articles about wasps infesting Pinus Mugo bushes. My shrubs have infestations every summer. Will you be doing any articles on this subject?

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