Help me kill the Goutweed (Aegopodium)
Further to the post regarding the sale of goutweed:
Please help! The goutweed at my mom's house has reverted to the super-invasive green color type and is escaping into the lawn. It has already drowned out it's variegated siblings, overwhelmed the smaller shrubs, and engulfed all of the perennials.
How do I kill it? I am reluctant to pour Roundup on everything.
Will blanketing all the beds with cardboard & mulch for a year be successful? How much do I need to cover the beds, to prevent their roots from reaching horizontally underground and popping up even further into the lawn? Is a 2' wide "safety zone" enough to contain this beast?