Neil Sperry: The best way to treat for dandelions Jan. 1, 2021 FacebookTwitterEmail 1of3 For controlling a dandelion overgrowth, a broadleafed weedkiller spray is less expensive than pre-emergents and just as effective.Courtesy photoShow MoreShow Less 2of3 Fungus gnats live in the green ?“mossy?” algal growths that develop where there is constant moisture, such as slow-draining plant pots or plumbing leaks.Courtesy photoShow MoreShow Less 3of3 Mexican petunia is gorgeous but really invasive.Courtesy photoShow MoreShow Less Q: Our yard is inundated with dandelions. We applied a pre-emergent, but still we’re covered up. There are too many to dig. What should we do?