Growing Evergreen Shrubs in Cold Climates
Gardeners considering shrubs for zone 4 must be aware that USDA plant hardiness zones are simply temperature guidelines, and although they are helpful, they don’t consider microclimates within a zone, influenced by wind, snow cover, and other factors. Cold hardy evergreen shrubs must be tough and resistant to unavoidable temperature fluctuations that frequently occur in winter. A thick layer of mulch provides much needed protection to the roots during cold winter months. It’s also a good idea to plant zone 4 evergreen shrubs where the plants aren’t exposed to warm afternoon sun during winter afternoons, as sub-zero temperatures that often follow warm days can do serious damage.
Evergreen Shrubs for Zone 4
Needled evergreen varieties are commonly planted in cooler zones. Most juniper shrubs are suitable for growing in zone 4, and many are tough enough to tolerate zones 2 and 3. Juniper is available in low growing, spreading varieties and more upright types. Similarly, most types of arborvitaes are extremely cold hardy evergreen shrubs. Spruce, pine, and fir are also very cold hardy evergreen. All three are available in a range of sizes and forms. Of the above-mentioned needle-type plants, here are some good selections:
Buffalo juniper (Juniperus sabina ‘Buffalo’) Emerald Green arborvitae (Thuja occidentalis ‘Smaragd’) Birds Nest Norway spruce (Picea abies ‘Nidiformis’) Blue Wonder spruce (Picea glauca ‘Blue Wonder’) Big Tuno mugo pine (Pinus mugo ‘Big Tuna’) Austrian pine (Pinus nigra) Russian cypress (Microbiota decussata)
Zone 4 evergreen shrubs are popular in the landscape too. Here are some suitable broadleaf evergreen choices for this zone:
Purple Leaf wintercreeper (Euonymus fortunei ‘Coloratus’) Winter Red holly (Ilex verticillata ‘Winter Red’) Bearberry/Kinnikinnick (Arctostaphylos) Bergenia/Pig squeak (Bergenia cordifolia)
