When purchasing a lemon for the specific purpose of planting a lemon tree, ensure that the lemon has seeds; many stores now sell seedless lemons.
According to Marion Owen, writing in the PlanTea website, lemons naturally grow best in areas that with an average temperature of 54 to 70 degrees. Although they are considered an evergreen tree, the lemon trees will go into dormancy when temperatures dip below 54 degrees at night.
Lemon trees come in a variety of varieties and heights. Before planting the lemon seed, make sure you are prepared with an adequate space for the tree; some lemon tree varieties may grow up to 20 ft. high.
In-door varieties of lemon trees are quite popular and may be purchased from a nursery or home center; average size is 3- to 5-ft. tall.
It may take up to 15 years before a lemon tree produces fruit.