For many gardeners, saving seeds from one year to the next is a challenging and enjoyable exercise that often has mixed results. Many garden vegetables have seeds that can be easily saved, while others, such as onions, can prove to be difficult. The key to saving any type of seed is to know the plant. Hybrid plants may not produce seeds that will grow the exact same plant the next year.
Select one or two strong and healthy onion plants in your garden and allow them to form seed heads at the top of the plant.
Watch the seed heads closely and remove them before they split open. You can then dig the onions for use.
Open the seed head over clean paper towels. Spread the seeds over the towels to dry for two to three days.
Place the onion seed in a paper envelope and seal the envelope closed. Label the envelope with the contents and the date of saving.
Store the sealed envelope in a glass jar with a tight fitting lid and place in a cool, dark place until ready to plant.