Answer: Cold hardy palm trees can be assisted during very cold winter weather. First, plant your cold hardy palm trees in a warm, sunny spot protected from winter winds, especially winds from the north and west. During cold snaps you can protect your cold hardy palm trees through wrapping the trunk. A cardboard box or a blanket placed on top of a small palm, and weighted down with rocks, can provide adequate shelter for most cold hardy palm trees species. The protective cover should be removed after four or five days. Another method to protect your cold hardy palm tree is to temporarily bury it under a mound of mulch. Most of the mulch should be removed once the weather warms up.
When to protect your palms depends upon their type. Some are tolerant of very cold temperatures and others are damaged at temperatures lower than 45F. Here are a few of the most popular palms for the Skagit Valley area and their degree of hardiness. Use this information to guide you into providing protection when you know the temps will dip below the coldest temperature your particular palms will tolerate:
True Date Palm Trees (Phoenix dactylifera) (Date Palms are cold hardy to 18 degrees)
Canary Island Date Palm Trees (Phoenix canariensis) (Canary Island Palms are cold hardy to 15 - 18 degrees)
Texas Sabal Palm Trees (Sabal mexicana) (Texas Sabal Palms are cold hardy to 16 - 18 degrees)
Mediterranean Fan Palms (Chamaerops humilis) (Mediterranean Fan Palms are cold hardy to 5 - 15 degrees)
California Fan Palm Trees (Washingtonia filifera) (California Fan Palms are cold hardy to 15 degrees)
Windmill Palm Trees (Trachycarpus fortunei) (Winmill Palms are cold hardy to 5 degrees)
Pindo Palm Trees (Butia capitata) (Pindo Palms are cold hardy to 12 - 15 degrees)
Sago Palms (Cycas revoluta) (Sago Palms are cold hardy to 20 degrees)
Mexican Fan Palm Trees (Washingtonia robusta) (Mexican Fan Palms are cold hardy to 18 degrees)
Queen Palm Trees (Syagrus romanzoffiana) (Queen Palms are cold hardy to 20 degrees)
Best wishes with your palms.
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