Root clogs in pipes are one of the most common problems. Before using any chemical root killer, I always make sure it's safe for the type of pipe installed in the house. Some harsh solutions may temporarily remove roots but weaken the plumbing structure in the long term. Learn more about the best tree root killers for drains here. Mechanical cleaning combined with preventative treatments tends to produce longer-lasting results. I also keep an eye out for unusual patches of extra-green grass because they can indicate leaking underground pipes attracting roots.