One of the main benefits of greenhouses is they extend your yearly growing season, allowing you to have plants when they can’t be grown outdoors. This allows you to start seeds for your vegetable or flower gardens earlier in the spring and perhaps keep plants alive and producing longer into the fall. However, you can grow virtually anything in a greenhouse, from vegetables and herbs to your favorite houseplants and flowers. It’s just a matter of maintaining a proper temperature and humidity to help them thrive.