Arizona.edu: Symptoms of Micronutrient Deficiency in Plants - Plants need the right combination of nutrients to live, grow and reproduce. -- When plants suffer from malnutrition, they show symptoms of being unhealthy. Too little or too much of any one nutrient can cause problems.
Permaculture plant guilds combine three or more plants to mirror an ecosystem — producing food, building soil health, and providing food for pollinators. To learn more permaculture principles, check out out Tierra: Online course.