Calamansi or calamondin (Citrofortunella microcarpa) is a citrus tree that is a cross between a mandarin and kumquat tree. It produces orange fruits only about one and half inches in diameter. The tree itself is small, only averaging 10 to 20 feet in height. Even though the calamansi tree is native to the Philippines, it is cold hardy in USDA zones 8 to 11.
Plan to plant your calamansi in an area with full sun. It can tolerate some shade, but will produce more fruit in the sun.
Prepare the planting site. Dig a hole that is about 16 inches wide and deep. Mix in about 4 to 6 inches of organic matter like peat moss or compost. This will create soil that is better draining and more rich in nutrients.
Fill the hole back up so it is the same depth as the tree's current container.
Take the tree out of its container. Do not pull on the trunk if possible. Instead, tap the container with a hammer to get it free.
Set the tree in the hole. Keep the soil from the container in tact. If you notice the roots have started growing around in circles, it is root bound. Therefore, cut a 1-inch deep X on the bottom and four vertical cuts on each side of the soil.
Fill the hole the rest of the way with the soil and pack it down with your hands to fill in any gaps of air.
Water your tree well and keep soil slightly moist for the first month while the tree becomes established. Do not over water your tree so that it is sitting in water and becomes water logged.