Growing an indoor citrus tree can be quite rewarding! For indoor environments, consider smaller varieties like Calamondin or Meyer Lemon, which adapt well. They need bright, direct sunlight—about 8-12 hours a day, so a south-facing window is ideal. Keep temperatures between 65°F to 75°F and ensure humidity levels are consistent, as dry indoor air can be challenging. Use well-draining, slightly acidic potting soil and feed with a balanced fertilizer during active growth. Watch out for pests like spider mites and scale insects. With the right care, you could have a thriving tree and enjoy fresh citrus fruits!