The grapefruit tree (Citrus paradisi) is a subtropical citrus tree known for its large, juicy fruits with a tangy and slightly bitter taste. It is a popular choice for courtyard gardens due to its attractive evergreen foliage and vibrant fruits. Grapefruit trees require full sun and well-draining soil. They can be grown in containers and will provide you with a refreshing source of vitamin C, perfect for enjoying as a fresh fruit or in juices and salads.