17. Get Rid of Invasive Weeds
Hand weeding won't work on these guys because you'll never get 100 percent of the roots out of the ground, so they keep coming back. The only effective solution is a systemic herbicide, such as Roundup. "The problem is, weeds are usually mixed in with garden plants and the spray will kill anything it touches," says Roger Cook. "So I like to cut the weed down to the ground and, as soon as it leafs out again, paint the chemical onto the leaves using a foam brush." Coat all of its leaves, and it will finally die, roots and all.