Hardiness of Dwarf Lemon Trees

Dwarf lemon trees have been grafted onto a dwarfing root stock, such as "Flying Dragon," which limits their mature size to 6 to 10 feet tall. These trees have much the same cold resistance as regular lemon trees, but they have a decided advantage because it's easier to protect them from the cold if a freeze is predicted, thanks to their small size.

Hardiness Zones

Dwarf lemons, just like the standard-size varieties, are extremely sensitive to cold temperatures. They are hardy in U.S. Department of Agriculture plant hardiness zones 9 through 11. Frost is unusual but not unheard of in those areas, though, and even a tree planted in warm climates might suffer frost damage. Dwarf lemon trees can tolerate very light frosts, and will survive temperatures as low as 32 degrees Fahrenheit for two to three hours without damage. Colder temperatures will damage or even kill the tree.


Cold hardiness depends, in part, on the dwarf lemon tree variety. "Meyer lemon" (Citrus x meyeri), which is not a true lemon but actually a type of orange, is more hardy than true lemons, including "Eureka" (Citrus x limon "Eureka") and "Lisbon" (Citrus x limon "Lisbon"). "Ponderosa" (Citrus x limon "Ponderosa") lemons are among the most sensitive to cold.

Cold Protection

Dwarf lemon trees suffer the most damage from frost during their first three years of life. Older trees can handle a bit more cold. To minimize the risk of cold injury, plant your dwarf lemon tree near the south side of your house, where heat tends to collect. Plant trees in full sun and irrigate them frequently to keep them healthy. If a freeze is predicted, string twinkle lights on the tree, which might offer enough warmth to fend off damage. Another option is to make a wooden frame to go around the tree and spread or staple cloth to it. Make sure the fabric doesn't touch the leaves, though, which will cause them to freeze. A large cardboard box, opened and spread around the tree, can also provide shelter. Finally, water the ground thoroughly. As the water evaporates, it warms up the air and soil, according to the University of California Extension Service.


If you live north of USDA zone 9 but would like to grow a dwarf lemon tree, consider growing it in a pot or container. Dwarf lemon trees are designed to grow well in containers. They need a sandy, lightweight potting mix and adequate moisture, sunlight and humidity. Add wheels to the container, and you can bring the tree outdoors during the summer months and bring it inside when inclement weather threatens. When the tree is outdoors, position it in a place protected from winds and temperature extremes. A protected, southern exposure with full sun is ideal.