- Light: For peak performance — from blooms to fruit — your indoor lemon tree needs close to eight hours of sunlight each day. The more light it gets, the better your results will be. Lemons generally do well in front of unobstructed south- or southwest-facing windows. You can also add artificial light if needed.
- Temperature: Indoor lemon trees grow best with nightly temperatures near 65 degrees Fahrenheit, which suits most homes fine. Lemon trees won't tolerate hot or cold drafts, so place them away from all air conditioning and heating ducts.
- Water: To keep your lemon tree healthy, allow the soil to dry out about 3 inches deep before you water. Then water thoroughly until it runs through the pot's drainage holes. Keep the soil moist, not overly wet, but never let it dry out completely. Test soil with a moisture meter (available online and in garden centers) or use your index finger instead.
- Alternative Care: With popular indoor varieties your tree should bear fruit on its own, but you can also help it along. When flowers are blooming and you stop to inhale the intoxicating fragrance, gently shake the branches to help spread pollen within the blossoms.