Chаnge the wаter every few dаys in order to regrow spring onion. Keep your pot in full sun, and water the soil every few days. You can regrow the green portion in water repeatedly or grow roots and plant it so the bulb grows to maturity. Onion water is a homemade extract gotten from either blending and straining onions or by juicing directly. Set the onion, roots down, on top of the glass with the toothpicks resting on the rim. Onions don’t even need soil to grow. This way, the roots will be able to drink up water so the onion can grow, while the rest of the onion will be surrounded by air to avoid rotting. The water will cover the roots and the white bulb section. Check the root end to see if new material is starting to grow. Plant these in autumn or spring, 10-15cm apart in well-prepared, moisture-retentive, fertile soil in full sun. You can grow onion (Allium cepa) bulbs in water, much like hyacinths (Hyacinth spp. Cover just the bottom area and let the new growth occur above the water. Another great thing is that you can plant green onions all year round, though the fastest growing time is summer. The onion's new growth will always be from the center area of the onion, so you can peel away most of the old grow before you put it into the soil. Method 1 of 3: Sprouting New Onions from Old Bulbs. Set the onion, roots down, on top of the glass with the toothpicks resting on the rim. The roots and base of the onion should be immersed in water. If the onions water is too low, the onions will dry out and won’t grow. Choose a deep container with drainage holes in the bottom. This method offers a front-row seat to plant growth, as you can watch the roots extend into the water and observe the sprout growing out of the onion top. Watering the onion cuttings adapt to its new surroundings plus makes the roots grow quicker. Growing onions in water is a great way to reuse kitchen scraps, not to mention a fun activity that helps kids learn about vegetables. If so, wait until that lovely bundle of root tendrils reaches at least 1″ and preferably 1.5″ in length, then plant it. To grow green onions, plant seeds at the end of winter, as soon as the soil is workable, and water them regularly. This method offers a front-row seat to plant growth, as you can watch the roots extend into the water and observe the sprout growing out of the onion top. Water Method. Add one inch of tap water to a glass. According to the National Gardening Association, onions grow best with weekly soaking, rather than light watering every day. This method offers a front-row seat to plant growth, as you can watch the roots extend into the water and observe the sprout growing out of the onion top. Prepping Green Onions to Grow in Water. Keep the contаiner neаr а sunny window if you cаn, so thаt the onions get some light. When the onion tops begin to fall over, stop watering. The roots and base of the onion should be immersed in water. Onions are able to grow in many different types of soils, but for best results, soil should be well drained, rich, loamy, free of weeds and grass, and slightly on the acid side. Tempt them with a bowl of water and they spring (no pun intended) into action. I now have two onion plants growing from one onion bottom. After some days the onion gets sprouted from the cutting. Don’t water blindly though, and check the dampness of the soil before watering. Too much water. Move closer to a sunny window. The roots and base of the onion should be immersed in water. The onion can tolerate air temperatures as high as 90°F, but, if the temperature of the air or water drops below 40°F the onion will bolt, (stop developing). Since onions naturally re-sprout, you can grow new onions from old onion scraps or you can grow them from seeds. 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