Home & Garden Garden Using Lemons as a Weed Killer By Kara DiCamillo is a communications specialist and marketer from Rhode Island with an interest in sustainability. our editorial process Kara DiCamillo Updated April 23, 2020 CC BY 2.0. Daniella Segura Share Twitter Pinterest Email Garden Planting Guides Indoor Gardening Urban Farms Insects Daniella Segura/CC BY 2.0 We’ve given you a few eco-tips lately involving lemons: one was that they whiten your laundry naturallyand the other was a homemade solutionto help your dry hands and feet. Now we’re going to tell you that you can use lemons to kill those pesky weeds that are currently growing between your bricks and are just a pain in the you-know-what. We actually tried it just to be sure it did the trick before we reported this eco-tip to you. Simply douse the weeds with lemon juice and they will likely shrivel within a day or two. We found that they rarely need a second treatment. Other alternatives also include vinegar or boiling water. Try all three for those resilient ones that just don’t want to stop growing.