we take 2 jars full with water and keep onion on the top just the root should touch it then leave it for 2 days and then cut one root and then observe it for 2 days will it regrow? and why?
Answers
Answer:
Onions (Allium cepa) are biennial plants for U.S. Department of Agriculture plant hardiness zones 3 through 9 that are usually treated as annuals and harvested before they complete their life cycles and go to seed in the second year. You may have noticed a forgotten onion in your pantry beginning to sprout. You can regrow the roots in water and grow it to seed as a houseplant. Smaller green onions are simply onions harvested before the bulbs mature. You can regrow the green portion in water repeatedly or grow roots and plant it so the bulb grows to maturity.
Green Onions
Trim any bits of old roots back as close to the bulb as possible, using a pair of scissors. Cut any remaining green portion off the onion, leaving only the small bulb.
Place the onions in a clear glass or jar with the root end down. Add just enough water to the bottom of the container to cover the roots at the bottom of the bulbs. Change the water at least every other day.
Place the glass in a window that receives plenty of filtered sunlight throughout the day. You should notice new root growth within a few days and the green stalk will also begin growing. After the roots reach at least 1 inch long, you can transplant the onions to well-drained potting mix and trim back the green stalk as needed for making salads and other dishes.
Mature Onions
Trim the old roots back to the bulb, if the onion has roots. Leave the papery skin intact. The roots grow from the bottom, round end of the bulb, while the plant sprouts from the tapered tip.
Insert four toothpicks into the side of the onion, spaced evenly around the bulb. Push about one-third of the toothpicks into the side of the onion, positioned about halfway between the roots and tips.
Suspend the onion over a wide-mouthed jar or similar clear container with the toothpicks resting on the mouth of the jar to hold the onion in the center. Take note of where the root end rests in the glass.
Remove the onion and fill the jar with water so the roots and bottom one-third of the bulb are under water. Replace the onion over the jar.
Set the jar in a window that receives full, filtered sunlight for a minimum of six hours daily. You should notice new roots within a few days, with several small roots within one week. Change the water daily or every other day so it doesn't become dirty. Transplant the onion bulb to a pot with well-drained potting soil after roots reach 1 to 2 inches long.
Things You Will Need
Scissors
Glass or jar
Toothpicks
Wide-mouthed jar
Tip
Try this project with young children as a lesson in how plants grow. It's easy to talk about roots growing in the soil, but kids can actually see the roots growing in the water.