You do not need two lemon trees to successfully grow and harvest lemons in your garden or orchard, because the vast majority of cultivated lemon tree varieties are self-fertile or self-pollinating. Each individual flower contains both male and female reproductive organs, allowing a single tree to set fruit independently without requiring cross-pollination from a second companion tree. Insects like bees or gentle wind breezes easily facilitate the self-pollination process, making a single backyard lemon tree entirely sufficient for home gardeners wanting fresh citrus fruit.