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All citrus trees love the sun, and the Meyer lemon tree is no different. It will grow and fruit best in full sun, though it can survive in a slightly shady spot. Opt for your sunniest window when growing your plant indoors, or use grow lights to supplement the natural sunlight.
Meyer lemon trees can grow in almost any type of soil with good drainage. They prefer a soil pH between 5.5 and 6.5 and thrive in loamy or sandy soils. Add lime to increase the soil pH or sulfur to lower it if necessary.
Proper watering is one of the keys to growing any citrus plant, particularly those grown in pots. The aim is to keep the soil moist but not soggy. Stick your finger into the soil at least up to the second knuckle. If you feel dampness at your fingertip, wait to water. If it feels dry, water your plant until you see water run out the bottom of the pot.
If your plant is indoors, particularly in the winter when the heat is on, misting the leaves with water can help to keep it healthy. It's also a good idea to use pot feet, which allow water to drain out of the pot and prevent the plant from becoming waterlogged.
Meyer lemon trees are happiest in temperatures between 50 and 80 degrees Fahrenheit. That means unless you live in USDA growing zones 9 to 11, you should bring your Meyer lemon tree indoors when temperatures start regularly dipping below 50 degrees. If you live outside of its growing zones, bring your tree outdoors again during the spring when nighttime temperatures are consistently above 50 degrees. Place it in a sunny area protected from strong winds.
Citrus trees do best with humidity levels of 50 percent and above. If you don't have a humid enough spot indoors, fill a tray with rocks and pour water to just below the top of the rocks. Place the pot on top of the rocks, so humidity will rise up around the plant.