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A Step-by-Step Guide on How to Plant a Sprouted Onion


Can you plant an onion that has sprouted? Growing your own produce at home helps save money and promotes sustainability by reducing waste. We will discuss how to grow a sprouted onion step by step.

Selecting the Right Onion

Choosing the Right Type of Onion for Your Region

If you live in a cold climate, you should choose a long-day onion. While a short-day onion will be better suited for warm regions. You can consult with your local gardening center or do a quick online search. Some popular varieties include Walla Walla, Vidalia, and Texas Supersweet.

Checking the Sprouted Onion for Viability

Before planting a sprouted onion, it's essential to check its viability. This means determining if the onion is still healthy and able to grow. To do this, gently squeeze the onion to feel for firmness. Inspect it for any signs of rot or disease. If the onion feels mushy or shows signs of disease, it's best to discard it.

Preparing for Planting Sprouted Onions

Selecting the Right Seeds

Before growing onion from sprouted onion, it's important to gather all the necessary materials. These include: sprouted onions; plastic plant pots; high-quality potting soil; compost or fertilizer (optional).

Make sure the container is 6 inches with drainage holes. For example, a 1 gallon pot, planter box, or any other type of container. This is large enough to accommodate your sprouted onion. You should use high-quality and well-draining potting soil. You can mix in some compost or fertilizer for added nutrients.

How to Grow Onions from Sprouted Onions?

Instructions for Growing Onions that Have Sprouted

Using a gardening tool to create a small hole in the soil, about 2 inches deep. Carefully place the sprouted onion into the hole. Make sure the roots are facing down and the sprout pointing upwards.

Gently cover the onion with soil. Make sure the sprout is still visible above the ground. Press down lightly on the soil. Ensure it is in contact with the roots. Give your planted onion a good drink of water. Make sure to thoroughly saturate the soil around it. This will help the roots establish themselves in their new home.

Tips for Spacing Multiple Onions in a Garden Bed

If you are planting multiple onions in a garden bed, properly space them out to allow for healthy growth. Space your onions at least 4 inches apart from each other. Plant them in rows, with at least 12 inches between each row.

If you are planting different varieties of onions, make sure to space them even further apart. This avoids cross-pollination and potential flavor changes.

Consider using onion square foot gardening. You can plant 9 onions per square foot of garden space. This can help maximize your harvest while ensuring proper spacing.

planting sprouted onions

Care and Maintenance

Watering Schedule and Requirements

A good rule of thumb is to water your onion plants deeply once a week. Make sure the soil is moist but not saturated. You may need to water more frequently if your area has hot and dry weather. Monitor the soil moisture level and adjust your watering schedule accordingly.

Providing Adequate Sunlight

Onions are sun-loving plants that require at least 6 hours of sunlight per day. If you plant them in an area with insufficient sunlight, they may produce smaller bulbs or fail to bulb at all. Make sure to choose a sunny spot in your garden for planting your sprouted onion.

Fertilizing Tips for Healthy Onion Growth

Onions are heavy feeders and require regular fertilization throughout their growing season. A balanced, you can apply all-purpose fertilizer every 2-3 weeks, following the manufacturer's instructions. You can also use organic fertilizers to provide necessary nutrients for healthy onion growth. For example, compost or well-rotted manure.

Mulching to Conserve Moisture and Suppress Weeds

A layer of mulch around the base of the plant helps to retain soil moisture, keeping the onion roots hydrated. It also helps to suppress weed growth, which can compete with your onion plant for nutrients and water. Organic mulches such as straw, grass clippings, or shredded leaves are recommended for vegetable gardens.

Common Issues and Troubleshooting

Pests and Diseases

Some common pests that may attack your onions include onion flies, thrips, and maggots. These insects can cause damage to the leaves and bulbs of your onions. You should regularly inspect your plants for any signs of damage.

You can also use natural methods to keep these pests at bay. For example, companion planting. You may need to use chemical pesticides if the infestation is severe. Follow the instructions carefully. Avoid using them during harvest time.

Onions are also susceptible to fungal infections such as onion rust and downy mildew. You can prevent these diseases by ensuring proper air circulation and avoiding overcrowding of plants. If your onions do get infected, remove the affected leaves or bulbs immediately. Dispose of them properly to prevent further spread.

Overwatering or Underwatering

Onions need consistent moisture to thrive, but overwatering or underwatering can cause major issues. If your onions are constantly waterlogged, it can lead to root rot and other fungal diseases. They may be stunted growth or even death without enough water.

So water deeply once a week. Allowing the soil to dry out slightly between watering sessions. Avoid frequent shallow watering as this can lead to a shallow root system. If your area has heavy rainfall, consider planting your onions in raised beds or using well-draining soil.

Soil Issues

Onions prefer loose, well-draining soil that is rich in organic matter. Sandy loam or loamy soils are ideal for onion cultivation. If your soil is too heavy and compact, you can amend it by adding organic compost or well-rotted manure. This will improve drainage and provide essential nutrients for your onions to thrive.

A pH level of 6.0-7.0 is optimal for onion growth. You can add lime to raise the pH level or use sulfur to lower it. In addition, avoid planting onions in areas where other alliums have recently been grown. For example, garlic and leeks. This can lead to the build-up of soil-borne diseases and pests.

Harvesting Your Onions

Signs for Harvest

Bulb size: A good indicator of onion maturity is the size of the bulb. Most onions will reach full size around 3-4 months after planting.

Tops: When the tops of your onions start to fall over and turn yellow, the plant is finished growing and ready for harvest.

Neck softness: Gently squeeze the neck of an onion near the bulb. If it feels soft, your onion is likely mature and ready to be harvested.

Different onion varieties may have slightly different signs of maturity. So it's best to consult the specific information for the variety you are growing.

Proper Techniques for Harvesting Onions

Use a garden fork or shovel to gently loosen the soil around the onion bulbs. Carefully lift each onion out of the ground. Make sure not to damage the bulb or break off the tops.

Once your onions are lifted, use scissors or pruners to trim off the tops. Leave about 1 inch of the stem attached to the bulb. Gently remove any excess soil from the bulbs using a soft brush. Lay them out in a warm and well-ventilated area to dry for 2-3 weeks.


We discussed how to grow onions from onions that have sprouted. Planting your own vegetables allows you to have fresh produce available at your fingertips. You can grow your own fresh onions without any hassle by following the steps outlined.

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