Real Christmas trees can catch fire, especially if they are not properly maintained and cared for. Real Christmas trees are often dried out and flammable, making them more susceptible to catching fire if they come into contact with a heat source. Additionally, real Christmas trees can accumulate a lot of dust and debris over time, which can also increase the risk of fire. It's important to take precautions when using a real Christmas tree in your home, such as keeping the tree away from heat sources and regularly vacuuming it to remove any dust or debris.