Thursday, October 30, 2014

Giving Tender Plants Extra Frost/Freeze Protection

“Bundle up,” your mom always advised you when you went out to play in the frigid winds. The same advice applies for your tender and newer outdoor plantings. The freezing northern winds and freezing nighttime temps can damage or kill those annuals, perennials, shrubs, and trees that are more marginal in our Mid-Atlantic planting zones. If a plant is classified as hardy only to zone 8 or above, than it is wise to take a few minutes to evaluate it for frost/freeze protection needs. Here are the top methods to give your plantings a bit of warmth and relief during any freeze/frost alerts:
  • Take it indoors. You may not have a greenhouse, but you probably have a garage, cellar, or protected porch. Sometimes all your potted tender plant needs is a sheltered spot for those worst weeks of the year. You can also wrap a blanket or burlap around the base of the pot to keep it insulated. Alternatively, group a bunch of pots together and stuff the area with leaves.
  • Plant it right. The warmest part of your yard is most likely at the base of a southern-facing wall. This is the spot to plant your camellias, figs, and others in your zonal edge.
  • Mulch it. Pile up mulch around the base of the plant to give its root-zone a nice blanket of warmth. Grafted trees and shrubs especially are vulnerable to die-back, so give an extra mulching to your fruit trees and rose bushes now. Be sure to pull pack that mulch layer at the first signs of spring.
  • Cover it. If you have just a few small tender plants to cover or want to give an early start to next season, use a cloche or glass bell. (An assortment of Colonial era cloches is pictured here.). You can make a modern cloche out of plastic soda bottles or milk jugs. Be sure to take them off or vent them during the day. To vent them, you can prop them up with a small stick or on stones.
  • Blanket it. Watch the local weather closely and on the coldest nights of the year, have cover cloths or old blankets/sheets on the ready to throw over your plants. This is a good precaution to take on nights with an ice warning. Many plants that are solid Zone 6 and 7 can still suffer severe frost damage and breakage, so go ahead and cover them when an ice storm is predicted. Then uncover when the danger of icing has passed.
  • Insulate it. Surround your most vulnerable plants with a metal cage (like your old tomato cages) or plastic mesh and stuff the frame full of leaves. You can also wrap the plant burlap tied with twine to achieve the same purpose. Then unwrap and un-stuff your plant in early spring.
Finally, if you find you have a real cold spot in your garden that is a frigid micro-climate, consider more long-term solutions for this spot... 

See the rest of the article in the Washington Gardener November 2011 issue posted here:

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