Place the Grass Head in a container with warm water for a full night. At the beginning, it will float on the water surface however as soon as it absorbs enough liquid, it will sink.
Take the Grass Head out of the water and place it on a saucer next to a window. Generously water it once a day and avoid direct sunlight until you see sprouts out of the Grass Head.
The grass will sprout in 3-5 days. Make sure the Grass Head is always in the moist condition and placed in a bright area. Grass will keep growing 2-3 months depending on the maintenance.
Allow the grass to grow up to 5 cm or more and start trimming it and experimenting with different hairstyle. Mohawk, pony-tail, crew-cut.... style? Its up to you, have fun with it!