How To Plant Mango Seed From Fruit. Rub the outside of the mango seed with sandpaper or knife to break the outer skin of the seed. Once you plant polyembryonic seed, you need to wait up to four weeks for them to germinate in subtropical climates, but tropical conditions allow for seed germination in two weeks or less.
Remove the seed wrap it in damp paper towels. Rub the outside of the mango seed with sandpaper or knife to break the outer skin of the seed. Cut the husk open with a sharp knife.
Put the seed in water in a bowl and place it in a warm place for 24 hours.
Just stick that weird little naked embryo in a pot with whatever potting. Cover the seed with half an inch (1.27 centimeters) of soil. Germinating mango seed in water. You have to start with a ripe mango because otherwise the seed within the husk may not be mature enough to grow into a plant.