In many areas, English ivy is commonly grown as an outdoor ground cover. But you can also use it indoors. Grow a pot of ivy on a mantel or shelf where its stems can trail down. For a more formal effect, train the stems onto a topiary form. It’s also exceptionally easy to start new plants: Simply cut off a 5-inch-long section of stem, remove the bottom leaves, and pot it up in moist soil. If you keep it moist, the cutting should root in a couple of weeks.