To grow a mango tree from seed, clean the fruit from the seed, and allow the seed to dry for one to two days. Open the hard outer shell, remove the seeds inside it and sprout the seeds. After sprouts appear, plant the mango in a container, and keep the plant in a location with above-freezing temperatures. Water the tree lightly when necessary, and apply fertilizer once in the spring and once in the summer to encourage growth.
To determine whether the seed from a mango is viable, open the seed husk carefully, and examine the colors of the seeds inside the hull. Discard gray seeds. If possible, choose a mango that is locally grown, rather than a mango from the grocery store, to ensure the seed is viable.
To sprout the seeds in a container, place the seed on the surface of the soil and keep the soil moist until the seeds sprout. Use a germination heat mat to encourage sprouting. Alternately, soak the seeds in water for 24 hours, wrap the seed in a damp paper towel and place the wrapped seed in a clear, sealable bag.
Store the bagged seed in a warm, sunny location until it sprouts. Avoid exposing young mango trees to temperatures at or below 30 degrees Fahreinheit. After one to two years, plant the tree in the garden.