From Ground: Begin by watering the flowering grass plant to dampen the soil, making it easier to dig and protect the roots. Use your shovel or spade to make a circle trench around the plant, making sure you're wide enough to cover the plants root system entirely. Gently lift the plant by prying underneath the root ball with the spade.
From Pot: Water the flowering grass in its pot first. Then, turn the pot sideways and gently pull the base of the plant, encouraging it to slide out. If it resists, roll the pot between your hands and try again.
From Seedling Tray: Water the seedlings first. Then, using a thin stick or your fingers, gently push the soil from below to loosen the seedling. It's important to handle the seedlings by their leaves not their stem. Also, involve as much root as possible while removing it.