How can I effectively fertilize garlic to ensure a healthy and abundant harvest?

To effectively fertilize garlic for a healthy and abundant harvest, use a balanced fertilizer with nitrogen, phosphorus, and potassium. Apply the fertilizer in the fall before planting and again in the spring when the plants begin to grow. Avoid over-fertilizing as it can lead to excessive leaf growth and smaller bulbs. Additionally, consider using organic fertilizers like compost or aged manure for a more sustainable approach.