Coloring Nocturnal Lemons
"Lemons grow in tropical and sub-tropical climates and cannot withstand frosts and very cold temperatures. Their favored temperature is between 15–30 °C and they need ample quantities of sunlight. They thrive in fertile, well-drained soils, but are notable for tolerating very poor, infertile soil, such as sand. Lemons need plenty of water but should be allowed to dry out between waterings. Propagation is often by grafting as the stock is vulnerable to cankers and dry rot.
Lemons are grown commercially in Spain, Portugal, Italy, Turkey, and other Mediterranean countries. They are also grown in Argentina, India, Brazil and the United States."