Mango fruit produces two types of seeds; polyembryonic and monoembryonic. It is possible to propagate mango seeds if the fruit is the polyembryonic type as these plants produce a true seed. Indochinese fruit types are polyembryonic and are characterized as being yellow, green or light green in color. Mango trees grown from seeds will take up to six years to bring fruit production.
Remove all fruit from around the mango seed by gently cutting away the flesh and washing the seed.
Open the seed husk with a sharp knife, being careful to not cut through the internal seed kernel. Remove the seed kernel from the outer husk.
Treat the seed kernels with fungicide and place in a seed-starting pot filled with sterile soil that lightly covers the seed. Place the pot in a warm and brightly lit location. The seed will sprout in approximately eight to 14 days.
Transplant the seedling once the taproot and sprout begins to grow. The taproot will grow faster than the seed sprout and needs to be monitored during the initial growing process. Continue to transplant the seedling if the taproot outgrows the container.
Harden the tree seedling by placing it outside gradually once it is large enough to be planted outdoors. Place the seedling outdoors in full sun for a short period of time the first week. Gradually increase the length of outdoor time each week until the seedling is outside all the time.
Dig a hole as wide and deep as the current seeding pot. Gently remove the pot to prevent damaging the taproot. Place the seedling in the hole and fill the hole with water. Gently pack soil around the root structure once the water has absorbed into the soil.