To ensure fruit production in your indoor fruit and citrus tree grove, you may need to assist with pollination. Citrus trees are typically self-pollinating, but they can benefit from hand pollination. Gently transfer pollen from one flower to another using a small brush or cotton swab. This helps increase the chances of successful pollination and fruit set. Alternatively, you can introduce pollinators like bees or use a vibrating tool to simulate pollination.