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When winter weather transforms your sidewalk and driveway into a dangerous skating rink, how do you melt the ice and snow without destroying your lawn and ornamental plants?
The key is to choose an environmentally safer deicer, use it in moderation and according to instructions, and to apply it before it begins to sleet or snow.
All chemical deicers essentially work in the same manner, by lowering the freezing point of water. The most common ice melter is sodium chloride (NaCl), otherwise known as good old-fashioned rock salt. Its popularity can be attributed to its low price and wide availability. However, since salt water still freezes at 0°F (or -18°C), it is of little help when the temperature falls below this point. Rock salt can also be destructive: it can corrode your car and your concrete walkway, and it can damage or kill your lawn and ornamental plants.
A better bet is to use one of the alternative, safer salts on the market. These include Calcium Chloride (CaCl2), Magnesium Chloride (MgCl2), and Potassium Chloride (KCl). In general, these salts are more effective in reducing the freezing point of water to a lower temperature than rock salt, thus making them more effective in colder weather. Moreover, they tend to be less corrosive to metals and concrete, and are safer for lawns and ground-covers. Be sure to carefully look at the manufacturer's label for the listing of chemicals.
A newer, salt-free melting agent is calcium magnesium acetate (CMA), which is made from dolomitic limestone and acetic acid (the main compound of vinegar). This material has little impact on plants and animals, and is a good alternative for environmentally-sensitive areas. Pelleted fertilizers containing ammonium nitrate or ammonium sulfate are sometimes also used for melting snow and ice, but these tend to damage concrete more than the salts. For locations where chemical deicers are not appropriate, sand, kitty litter, or gravel can provide some traction, but they will not melt ice or snow.
Whatever product you choose, be sure to read the manufacturer's instructions carefully and do not over-apply. Too many people erroneously believe that if 8 ounces is good, then 16 ounces must be better. Improper use of any chemical deicer may cause plant injury, which appears as drying, stunting, dieback, or "burning" of the foliage.
(Sam Nelson is a landscape designer for Johnson’s Landscaping Service, Inc. Learn more about Sam and see his landscape design featured in the Washington Post at http://www.jlsinc.net/view-by-tag/washingtonpost/. )
Worried about your home's current value? Visit these links to learn how landscaping can help!
Lawn and Garden Equity
While studies show that you'll only recoup 80 to 90 cents on every dollar you spend to upgrade your kitchen or bath, professional landscape designers estimate that improvements to your lawn and garden can boost your home's value by 7 percent to 15 percent. Those findings have been confirmed by survey results from the Gallup Organization and the National Gardening Association, or NGA.
Value added: Consumers perceive a home with proper landscaping to be worth up to 11.3 percent more than its assessed value, according to 1999 study by Clemson University. The same study found that the return on the landscaping dollar is more than 100 percent.
"The whole trend for living outside is enormous right now" says Denis Flanagan, host of HGTV's One Garden, Two Looks and manager of membership services and PR for Landscape Ontario. "The garden has become an extension of the house."
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