Conifers, also known as evergreens, keep most or all of their foliage through the cold winter months. Called conifers because they produce cone-shaped seed pods, conifers can be categorised as narrow-leafed, broad-leafed or deciduous based on type of foliage. Most evergreen trees prefer full to partial sun, but some tolerate shady conditions.
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Full-sun conditions means at least 6 hours of direct sunlight each day. Though many conifers prefer full sun, a few absolutely cannot tolerate shade. These include pitch (Pinus rigida), red (Pinus resinosa) and Scots (Pinus sylvestris) pines; many cedars, including Atlantic white (Chamaecyparis thyoides), deodar (Cedrus deodora), Eastern red (Juniperus virginiana) and Japanese (Cryptomeria japonica); and other conifers including Black Hills spruce (Picea glauca), Colorado spruce (Picea pungens), Douglas fir (Pseudotsuga menziesii), laurel oak (Quercus hemisphaerica), live oak (Quercus virginiana), loblolly pine (Pinus taeda), longleaf pine (Pinus palustris), Norway spruce (Picea abies), Rocky Mountain juniper (Juniperus scopulorum), Serbian spruce (Picea omorika) and white fir (Abies concolor).
Many conifers thrive in light shade, or 4 to 6 hours of sunlight per day. These include American arbor vitae (Thujus occidentalis), Carolina cherrylaurel (Prunus caroliniana), giant arbor vitae (Thuja plicata), loquat (Eriobotrya japonica), Norway spruce (Picea abies), Prince of Wales juniper (Juniperus horizontalis Prince of Wales), wax myrtle (Myrica cerifera), white pine (Pinus strobus) and Winton Carpet juniper (Juniperus horizontalis Winton Carpet).
Partial-shade locations receive 2 to 4 hours of sun per day. Conifers suitable for partial-shade conditions include balsam fir (Abies balsamea), Pfitzer juniper (Juniper chinensis Pfitzeriana), Savin juniper (Juniperus sabina), Sargent juniper (Juniperus chinensis Sargentii) and Swiss mountain pine (Pinus mugo).
Shade locations are those that receive less than 2 hours of sun per day. Shade-tolerant evergreens include Carolina hemlock (Tsuga caroliniana), Eastern hemlock (Tsuga Canadensis), Emerald arbor vitae (Thuja occidentalis Smaragd), Globe arbor vitae (Thuja occidentalis Globosa), Japanese dwarf yew (Taxus cuspidata Nana), Japanese spreading yew (Taxus cuspidate), Taunton spreading yew (Taxus x media Tauntoni) and Techny arbor vitae (Thuja occidentalis Techny).
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- Ohio State University Extension; Evergreen Trees for Ohio; Jane C. Martin
- University of Minnesota Extension; Choosing Landscape Evergreens; Jeffrey Gillman, et al.; 2009
- University of Missouri Extension; Gardening in the Shade; April 2002
- North Carolina State University Cooperative Extension; Large Trees -- Over 30' Tall; Charlotte Glen
- North Carolina State University Cooperative Extension; Small Trees -- 10' to 30' Tall; Charlotte Glen
- Binghamton University; Nature Preserve & Natural Areas: Trees of the Nature Preserve