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The secret to a stunning spring garden lies in proper winter preparation. After three decades of creating resilient landscapes in Denver, we've developed a proven approach to winter landscape protection that keeps your outdoor investment safe during Colorado's harsh winters.
Timing is everything when preparing your winter landscape. In Denver, aim to complete most preparations by mid-October. This gives plants time to harden off before the first deep freeze while ensuring winter protection measures are in place.
Young trees are particularly vulnerable to winter damage. Wrap trunks with tree wrap to prevent sun scald and frost cracks. For evergreens, especially those exposed to winter winds, consider using burlap screens or anti-desiccant sprays to prevent winter burn.
Cut back perennials to about 6 inches above ground after the first frost. However, leave ornamental grasses standing – they provide winter interest and natural protection for their crown. Consider leaving some seed heads for winter birds and visual interest.
Your final mowing should be shorter than usual, about 2 inches. This prevents matting under snow and reduces winter fungal disease. Apply a winter fertilizer high in potassium to strengthen root systems for winter survival.
Proper irrigation winterization is crucial in Colorado's climate. Drain all systems thoroughly and insulate exposed pipes. Don't forget to remove and store hoses, and protect outdoor faucets with insulated covers.
While preparing for winter, consider adding elements that shine during the cold months:
Some winter landscape preparations are best left to professionals:
Use the winter months to plan next year's landscape improvements. Consider:
Begin your winter landscape preparations in early October, about 4-6 weeks before the typical first frost. This gives you enough time to complete all necessary tasks while plants are still actively growing, and ensures protection is in place before severe weather hits. For tree wrapping specifically, aim to complete this by early November.
New plantings less than two years old need the most protection, especially broadleaf evergreens like boxwood and rhododendrons. South or west-facing plants also require extra care due to winter sun exposure and freeze-thaw cycles. Young trees, roses, and borderline hardy perennials should be mulched and possibly wrapped depending on their location.
In Denver's dry winter climate, water your landscape once or twice per month during frost-free periods when temperatures are above 40 degrees. Focus on evergreens, young trees, and shrubs. Water during mid-day to allow time for absorption before evening freezing temperatures. Remember to disconnect and drain hoses after each use.
Leave light snow on evergreens as it provides insulation. However, gently brush off heavy snow from branches using an upward motion to prevent breakage. Never try to remove ice from plants as this can cause damage. For bent branches, allow ice to melt naturally rather than trying to break it off.
DIY tasks include light snow removal, winter watering, and basic mulching. However, consider professional help for irrigation blowouts, large tree pruning, installing winter protection for valuable plants, and specialized treatments like anti-desiccant sprays.
