The Christmas Cactus is a popular holiday houseplant that's prized for its beautiful red flowers and easy care. To keep your Christmas Cactus healthy and blooming, you'll want to use a light and well-draining potting mix. A 50/50 mix of regular potting soil and perlite is ideal, as the perlite will provide additional air circulation and drainage. Avoid using clay-based soils or anything too dense, as this can lead to root rot and other issues.