The gardenia tree (Gardenia jasminoides) is a beautiful evergreen shrub that produces fragrant white flowers. While not a citrus tree, it can be a lovely addition to a courtyard garden. Gardenia trees require partial shade and well-draining soil. They are known for their intoxicating fragrance and can add a touch of elegance to any outdoor space. Although they do not bear fruit, their stunning blooms make them a popular choice for garden enthusiasts.