Does Ice Melt Damage Plants?

Written by Admin and published on

Winters in Salt Lake City, Utah, can be snowy and icy. Snow will come down and partially melt, and then will freeze overnight, making things slick. We’ve got more cars than ever on the roads and snowy, slick roads, if untreated, will lead to accidents. The solution to slick roads for many cities is to send out snowplows to remove snow as soon as possible and then to put rock salt on the roads to melt ice and to improve slick spots. This method does clear roads and makes winter travel a lot safer than it could be. Thank goodness for things like ice melt and professional snow removal.

The only problem with this method is the negative effect of rock salt on plants, cars, and driveways. Rock salt can corrode cars and driveways. Too much rock salt (Sodium Chloride) will kill or injure the grass and other plants you just had the professional landscapers make look so pretty. The sodium in rock salt blocks a plant’s uptake of key minerals. The chloride in rock salt will essentially starve a plant, disrupting photosynthesis which is how a plant turns light into energy and food. It also takes needed moisture way from plants.

Ice Melt – After the Storm

Ice melt in the landscape

How Does Ice Melt Effect Landscaping?

There are several types of products used to manage snow and ice during winter months.  Rock salt (Sodium chloride) is one of the most commonly used de-icers.  It is inexpensive and very effective, but unfortunately can be potentially harmful to certain surfaces and plants that may be nearby.

Other types of products contain minerals like potassium, magnesium, or calcium.  These types of products are less likely to cause damage to the landscaping plants and hardscapes.  The downside is that they are more expensive than rock salt and may be more or less effective, depending on the temperature.

When rock salt is used to melt ice and snow, the salt dissolves in the snow.  The sodium separates from the chloride, and the chloride is absorbed by plant and turf roots.  This may cause damage to plant cells resulting in yellowing or browning of the foliage.  The salt that remains in the soil can burn roots and prevent vital nutrients from being absorbed during the growing season.  Salt, in high concentrations, can also draw moisture out of plant tissues.

During the winter, many trees and shrubs don’t need a lot of water since they are not actively growing.  In the spring, when the leaves flush salts in the soil can cause drought-like symptoms and result in damage or death of new foliage.

What Does Ice Melt Damage Look Like?

Ice melt damage may take a long time to appear.  Severity of symptoms may vary based on the type of plant, the concentration of salt or other minerals, and rainfall.  Signs the landscape may have suffered damage from de-icing chemicals are:

  • Wilting foliage
  • Evergreen needles or leaves may turn brown or look scorched
  • Leaves of deciduous shrubs may develop brown edges
  • Lawns may have brown patches where snow treated with de-icing products was piled
  • Sidewalk or road facing sides of plants may have more severe signs of damage

Damage can extend beyond the borders of pavement like roads and sidewalks.  Spray from plows and passing vehicles can spread salt into surrounding planting beds resulting in further damage to shrubs.  Pedestrian traffic also moves ice melt products through the landscape – especially if people and animals walk between paved areas and lawn or planting areas.

The good news is that ice melt damage does not have to be a death sentence for plants and turf.  Lawns will typically recover on their own.  Turf roots are shallow and it does not take long for any excess salt or mineral concentrations to become diluted during spring.  If signs of damage appear in spring, the use of a gypsum-based fertilizer will also help to counteract the higher concentration of minerals in the soil.

Preventing Damage Caused by Ice Melt

While damage resulting from ice melt applications is reversible, it is best to prevent it in the first place.  Proper application of ice melt products coupled with adequate, but not excessive, product use can minimize damage to plants and lawns that are near drive-lanes and walkways.  Here are 5 best practices when it comes to ice melt usage:

  • Using Magnesium chloride, Calcium chloride, or Potassium chloride is less damaging to landscape plants than Sodium chloride.  They also tend to be more pet friendly.
  • When choosing locations to pile snow from sidewalks and roadways, avoid piling snow on or around landscaped areas.  Many times, this piled snow also has de-icing chemicals mixed in.  As the snow melts, the harmful chemicals move into the soil profile.
  • Burlap or other breathable wraps can protect valuable specimen plants and evergreens that line roads or walkways.
  • Take care not to spray or spread ice melt onto nearby plants or lawns.
  • Evergreens are especially susceptible to ice melt damage because they have foliage year-round.  Extra care applying ice melt near evergreens will minimize damage.

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