When should I wrap shrubs and trees for winter protection in NB?

The ideal window for wrapping shrubs and trees in New Brunswick is late October through mid-November, after the plants have gone fully dormant but before heavy snowfall and sustained freezing temperatures arrive. Wrapping too early traps heat and moisture, encouraging fungal growth, while waiting too long means working with frozen materials and risking damage from early winter storms.

Not every shrub or tree needs wrapping — focus your efforts on the most vulnerable specimens. Broadleaf evergreens like rhododendrons, azaleas, boxwood, and holly are the top candidates because their leaves continue to lose moisture through winter while frozen roots can't replace it. This desiccation — often called winter burn — turns leaves brown and crispy, and it's particularly severe in NB's Zone 4a-4b inland areas around Fredericton and Woodstock where wind chill regularly reaches -30°C or colder. Newly planted evergreens, arborvitae hedges, and any Zone 5 plants growing near their hardiness limit also benefit from protection.

Burlap screens are the gold standard for NB winter protection. Drive three or four wooden stakes around the plant and staple burlap to them, creating a windbreak without the burlap touching the foliage. Direct contact between burlap and leaves causes abrasion damage and can freeze to the plant tissue. Leave the top open to allow air circulation and let snow settle naturally on the plant, which actually provides insulation. For individual specimen shrubs, you can create a burlap tent supported by a central stake.

Anti-desiccant sprays offer an alternative or complement to burlap. Products like Wilt-Pruf create a waxy coating on evergreen needles and leaves that reduces moisture loss by up to 80%. Apply these on a dry day when temperatures are above 4°C — typically in late October or early November in NB. One application usually lasts through winter, though exposed coastal locations near the Bay of Fundy may need a second application in February if there's a mid-winter thaw.

Young deciduous trees with thin bark — especially maples, lindens, and fruit trees — benefit from trunk wraps to prevent sunscald. NB's winter sun reflecting off snow can heat the south-facing bark during the day, then plummeting overnight temperatures cause the bark to crack. Wrap trunks with commercial tree wrap or plastic spiral guards from the base to the first branch, installing them in November and removing in April. Budget about $5-15 per shrub for burlap and stakes, or $10-25 per tree for trunk wrap. Professional winter wrapping services in New Brunswick typically cost $15-30 per plant plus materials, making it worthwhile for properties with many vulnerable specimens.

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