There are tons of different plants that you can use in your greenhouse. Depending on what you are looking for, you might want to think about a few different choices. Some people like to plant flowers so that they can have them around their home all year round. Others like to sell their greenhouse flowers to others so that they can make money on them. If flowers are not your think, planting produce might be the choice for you. You can choose many different types of produce to plant. Some like to use vegetables or even fruits in their greenhouse. It is going to be all up to you and what you want to use in your greenhouse. Think about the ones that are easiest to plant. If you are a beginner, you do not want to use plants that are going to take a lot of work and effort. You do not want anything too difficult. Take your time and move up to different plants and produce as you go. Choosing plants that are going to work for you and your needs is important. You have to do your research and learn as you go on the greenhouse plants that you plant.