![]() ![]() Direct contact with the plant, risk of allergic reaction to urushiol oil. To increase the environmental friendliness of the natural poison ivy spray, replace the dishwashing liquid with castile soap. Too much sodium in the soil is toxic to other plants and may hurt helpful, native species in a woodland environment. Table salt may also be used, but overuse can cause a buildup of sodium in the soil. ![]() Replace the lid on the garden sprayer and use in the desired areas.Do not shake the solution, as this will cause the soap to foam. Add the soap, and gently swirl to mix the ingredients.Add the vinegar to a large garden sprayer.Apply on a dry and warm day for the best result. Repeated applications will likely be required due to the tough, oily leaves on the poison ivy plant. One gallon of weed killer spray will cover 1,000 square feet of garden space. Timing this method in the mid-to-late summer season will increase efficiency, as the plant is actively sending energy reserves to the root system and is more vulnerable to the loss of its leaves. This method does not remove the roots, so the poison ivy will return during the growing season. Make a natural spray to dehydrate the leaves of the plant and cause the top of the vine to die.
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