The Lisbon lemon is one of the most popular varieties globally, especially in hot regions. They are native to Australia, but they have Portuguese descent as well. The Lisbon lemon tree belongs to the Rutaceae family, and it grows on thorny evergreen trees.
The size of the fruit is about 2 to 3 inches, which is medium-sized for a lemon, and the trees can reach as high as 15 feet. Like many lemon varieties, the lemons are also slightly tapered towards the ends, and they have an oblong shape. The peel of the lemon is bright yellow, and the flesh tends to be a pale yellow or a green-yellow color. It is divided into 10 or 11 segments, and there are usually very few seeds or none at all.
The flowers of the Lisbon lemon tree are white, and they bloom in the spring. It produces fruit throughout the year, but they mostly grow in the winter and beginning of spring.
Lisbon lemon trees are best suited for USDA hardiness zones 9 through 11, but if they are kept indoors during the winter, they can grow in zones 4 through 10 as well.