Arborvitae (Thuja) are popular evergreen shrubs often used for privacy screens and hedges. Their dense foliage is susceptible to damage during harsh winter months, especially in exposed locations. Wrapping these plants in burlap serves as a physical shield against environmental stressors. The primary purpose of this protective layer is to prevent winter desiccation (winter burn), which occurs when cold winds and sun draw moisture faster than frozen roots can replace it. Burlap also protects the tree structure from heavy snow and ice loads that can cause branches to splay or break.
Determining the Optimal Removal Time
Removing the burlap requires careful timing, as acting too early or too late can damage the plant. Focus on environmental cues rather than the calendar date. The burlap must remain in place until the soil around the base of the arborvitae is completely thawed, allowing the root system to resume water uptake. A dependable sign is when daytime air temperatures are consistently above freezing, eliminating the risk of a hard freeze.
Sun scald damage remains a danger until the harshest periods of direct, low-angle winter sun have passed. Wait until sustained temperatures are reliably above 28 degrees Fahrenheit. This threshold minimizes the freeze-thaw cycles that injure bark and foliage. Removing the wrap too late creates a microclimate of high humidity and poor air circulation. This enclosed environment can foster fungal pathogens and mold, potentially causing the foliage to rot.
The Step-by-Step Unwrapping Technique
Removing the burlap requires careful attention to avoid snapping branches that are brittle from the cold. Use a sharp utility knife or scissors to cut securing twine or rope, taking care not to nick the underlying branches or trunk. Start the unwrapping process from the top of the arborvitae and gently peel the material away, moving downward. This top-down approach prevents the weight of the burlap from tearing downward on the foliage.
The removal should be completed in a single session once optimal weather conditions are present. Gradual peeling prolongs the risk of moisture buildup and disease development inside the wrap. As the burlap is removed, gently ease any compressed branches back into their natural position. Avoid forcing or shaking the plant aggressively, allowing the branches time to settle back into their original form.
Post-Removal Care and Assessment
Immediately after removal, the arborvitae requires deep watering to counteract any winter desiccation. Thorough soaking encourages the flow of moisture back to the foliage, especially if the ground has just thawed. Apply water slowly to the base until the root zone is saturated. This method is far more effective than a light surface sprinkling and is important for evergreen health and recovery.
Conduct a full assessment of the plant for signs of winter injury, such as broken branches or sun-scorched needles (brown or yellow patches). Prune any cleanly broken branches using sharp, clean shears, cutting back to a point of healthy, green wood. If the arborvitae was heavily shrouded, it will need a short period to re-acclimate to full sunlight. Monitor the plant over the following weeks for signs of stress, such as browning foliage. Ensure good air circulation around the shrub is maintained to prevent fungal issues.