Stick the potato with three to four toothpicks around the width and rest the toothpicks on the top of a quart glass jar.
Fill the jar with water, submerging up to an inch of the potato's bottom. Avoid overwatering the potato and maintain the water level throughout the sprouting process.
Place the jar in a sunny spot like a windowsill. Morning sun is best for new plants as the afternoon sun is too direct.
Check the potato every day and refill the water as necessary. Fuzzy roots should sprout within a few days. After a week, small leaves sprout from the potato’s top.
Remove the potato carefully from the jar after about two to three weeks. Plant it in a large pot filled with sandy loam organic gardening soil or directly into a garden area.