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Option 2: Rock Salt. Although it takes longer than chemical herbicide, rock salt can effectively kill tree roots by robbing them of water. TOOLS AND MATERIALS – Rock salt – Water
Gena Lorainne, a gardening and landscaping expert at Fantastic Services suggests killing tree roots with rock salt. 'Dig several four inch holes into the cut surface of the tree trunk. Additionally, you can also drill some holes in the exposed roots (if present),' she says.
Find out how to make a powerful tree root killer using rock salt, vinegar, baking soda, and Epsom salt in removing stumps and preventing tree root obstruction on your sewage and pipe system.
Killing tree roots with salt can take several months but is relatively labor-free. Rock salt and Epsom salt are the most effective. Keep in mind that all salts can remain in the soil, damaging the surrounding ecosystem.
Using salt is a cheap and effective way to kill tree roots and accelerate the rotting process of the stump. The best time of year to kill tree stumps is from late May through mid-August. This is when their growth declines as they prepare to enter winter dormancy.
Rock salt: “The safest way, and the way I prefer, to get rid of tree roots from pipes is old-fashioned rock salt that you buy cheaply from any grocery store,” Klein says. “It draws out moisture from the roots, and they eventually dry up.
If you paid attention in high school science call, then you know that rock salt will, in fact, kill tree roots. But if you try to wash a bunch of crystalline rock salt down your sewer line, it is likely to add to your clog issues and do more damage than good.
Rock salt, like Morton's ice cream salt used to help melt ice in the preparation of homemade ice cream, is available year-round at home and garden centers. Otherwise, use four pounds of rock salt from a bag of rock salt available during winter months for melting ice on sidewalks.
Rock salt is available at most hardware stores and is a popular solution to suck moisture from roots and kill them. Slowly flushing about 2 pounds’ worth down the toilet often does the trick.
Rock salt or Epsom salt can damage and kill tree roots over several weeks and can even assist in removing the tree's stump. However, you need to drill holes or cut into the stump and surface tree roots to inject them properly with the salt.