Growing different types of plants together is an advantageous strategy for the betterment of all your garden plants, and a good understanding of how different plants can help or harm each other will set you up for success in your garden. Lemon trees like sun and warmth, slightly acidic, rich in organic matter, and somewhat moist, but definitely not wet soil. Also, lemon trees like the presence of some plants, but they also don't like the presence of some other plants.