The calamondin tree (Citrofortunella microcarpa) is a small citrus tree that produces small, round fruits resembling miniature oranges. It is a popular choice for courtyard gardens due to its compact size and decorative value. Calamondin trees require full sun and well-draining soil. The fruits have a sour taste and are often used in marmalades, preserves, or as a garnish for cocktails. Additionally, the tree's glossy leaves and fragrant flowers make it an attractive ornamental plant.