Sago palm seeds require well-drained, loose soil to grow. Fill a 4-inch diameter pot with a commercial seed-starting mix or a combination of equal parts of perlite and peat moss. Tamp the soil to level the surface. Push the seed sideways in the soil. Avoid burying the seed -- keep about one-third of the seed above soil level. Tamp the soil so it's firm around the seed, and moisten it with water. Cover the pot with plastic wrap to keep moisture in.
Sago seeds need a temperature between 70 and 100 F to germinate. Place the pot on a heating mat to provide a consistent temperature. Keep the soil damp throughout the germination period. Once the seeds germinate -- within about one to three months -- remove the plastic wrap and place them in a sunny window. Transplant the sago palms into larger pots as they grow. If you wish, you can plant them outside after about three years.