The nickname for the Ponderosa lemon is "The Five Pound Lemon." With their bumpy skin and extra-large girth they don't resemble a true lemon. That is because the Ponderosa lemon is a cross between lemon and citron. Yet the flavor of the lemon remains, and the juice of this fruit is used the same way you would use the juice of a normal lemon. Lemons are the least cold hardy of the citrus fruit trees, according to agriculturalists at Texas A&M University, and the Ponderosa lemon tree is even less tolerant of the cold. This tree grows most successfully in the warmer climates of California, Texas and Florida.
Choose a planting site that receives full sun all day.
Remove all weeds and grass in a 2-foot diameter around the planting site.
Dig a hole the same depth and twice the width of the pot in which the Ponderosa lemon tree is growing.
Tip the pot over on its side, and gently lift the tree from it. Using a gentle stream of water from the hose, rinse away the soil covering the outer roots of the rootball.
Place the tree in the hole, making sure that the bud union (the swelling on the lower part of the trunk where the tree was grafted) will be 2 inches above the soil.
Fill the hole halfway with soil, then fill it with water. Allow the water to drain and finish filling the hole with soil. Mound the soil 1 inch up the base of the tree and pack it tightly.
Form a circle around the tree made out of soil, mounded 3 inches high and 8 inches wide, placed 2 feet away from the base of the tree.
Fill the watering ring with water right after planting.
Water again in three days and every three days for the first two weeks. After that, water once a week. According the agriculturalists at Texas A&M University, the watering ring will eventually wear into the soil and the tree will, at that time, be established.