How To Grow Onions From Seed: A Comprehensive Guide For 2023

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Growing Onions from Seed Has Benefits Southeast


Growing onions from seed is a rewarding and cost-effective way to enjoy fresh and flavorful onions right from your own garden. Whether you are an experienced gardener or a beginner, this comprehensive guide will provide you with all the information you need to successfully grow onions from seed in 2023.

Why Choose Seeds?

Using seeds to grow onions offers several advantages. Firstly, you have a wide variety of onion types to choose from, including sweet, red, and yellow onions. Secondly, starting from seeds allows you to control the entire growing process, ensuring that your onions are free from pesticides and other chemicals. Lastly, growing onions from seed is more economical compared to buying onion sets or transplants.

When to Start

The best time to start growing onions from seed is in early spring, around 8-10 weeks before the last frost date in your area. This timing will give your onion seedlings enough time to mature before transplanting them outdoors.

Preparing the Soil

Onions prefer loose, well-draining soil with a pH level between 6.0 and 7.0. Before planting the seeds, prepare the soil by removing any weeds and adding organic matter such as compost or aged manure. This will help improve soil fertility and drainage.

Sowing the Seeds

Start by filling seed trays or containers with a seed starting mix. Moisten the mix before sowing the onion seeds, as this will help with germination. Sow the seeds thinly and cover them with a thin layer of soil. Keep the trays or containers in a warm area and maintain consistent moisture levels.

Caring for Seedlings

Once the seedlings emerge, provide them with adequate light. If growing indoors, use fluorescent lights or place the trays near a sunny window. Water the seedlings regularly, keeping the soil moist but not waterlogged. Thin out the seedlings when they are around 2 inches tall to allow enough space for proper growth.

Transplanting Outdoors

When the threat of frost has passed and the soil has warmed up, it’s time to transplant your onion seedlings outdoors. Choose a sunny location with well-drained soil. Dig shallow trenches and space the onion plants 4-6 inches apart. Gently lift the seedlings from their containers and place them in the trenches, covering the roots with soil. Water the transplants thoroughly.

Onion Care Tips

To ensure healthy onion growth, keep the soil consistently moist but not saturated. Mulching around the plants will help retain moisture and suppress weed growth. Regularly remove any weeds that may compete with the onions for nutrients. Fertilize the onions every 2-3 weeks with a balanced organic fertilizer to promote strong growth.

Harvesting Onions

Onions are ready to harvest when the tops start to yellow and fall over. Gently loosen the soil around the bulbs and lift them out of the ground. Allow the onions to dry in a warm, well-ventilated area for a few days. Once completely dry, trim the roots and tops and store the onions in a cool, dry place.


Growing onions from seed is a rewarding and satisfying experience. By following these guidelines, you can enjoy a bountiful harvest of delicious onions right from your own garden. So, why wait? Start your onion-growing journey today and enjoy the fresh and flavorful taste of homegrown onions in 2023!

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