The cul de sac is one of the first areas you will visit in the DLC and can be returned to at any time. Gardening weapons that maim include axes, machetes, rakes, shovels. If you don't have a gardening weapon, a shovel can be found in the cul de sac behind the last house on the left. Also, this is cumulative, so you don't need to get all 10 maims in one go.