Landscapers typically grow yucca for ornamental purposes, but they may sometimes grow out of control and need to be killed with herbicides, according to Texas A&M University. Remove the dead outdoor yucca plant to free up room in your garden and minimize the risk of attracting insect and animal pests that may be drawn to the dead plant.
Wear closed-toe shoes, long pants, a long-sleeved shirt and gloves. A yucca plant's foliage can be serrated and may inflict serious injuries, even when the plant is dead.
Cut off the plant's spiky foliage with pruning shears until all you have left is the plant's central stem or trunk. Rake up the discarded foliage and either discard it or chop it into smaller pieces to add to your compost pile.
Chop the plant's center stalk down to the ground. Use pruning shears for thin, juvenile plants. Otherwise, the stalk will likely be thick and you'll need to use a saw, ax or a mechanical tool like a chainsaw.