Collard greens grow best in full sun to partial shade, with fertile, well-drained soil, and require consistent moisture for optimal leaf production. Ecologically, they enrich the soil with nutrients and help deter pests, making them valuable companion plants in vegetable gardens. Nutritionally, collard greens are high in vitamins A, C, and K, calcium, and fiber, while medicinally, they support bone health, improve digestion, and provide antioxidants that help reduce inflammation.