Onion seeds need to be planted in early winter for this method to be successful.
This winter-sowing method is a kind of "set it and forget it" method of growing onions from seed.
1. Poke holes in the bottom of the container for water drainage. 2. Poke a few holes in the top of the container to allow for a bit of airflow. 3. Fill the container with potting soil and add water so it is moist but not soggy. 4. Sprinkle the onion seeds evenly over the top of the soil. 5. Press the seeds into the soil so they are just ⅛" under. 6. Close the lid. 7. Label the container – this is especially important if you're planting more than one type.
There are short day onions, long day onions, and day neutral onions. What do those terms mean, find out more on our blog.
It is normal for onions to push up from the soil as the bulbs grow. Let them.
Onion seeds has one of the shortest seed storage shelf lives. Start from fresh onion seed every year and don't hold any extra over.
Onion sets are one option for growing your own onions, but they do have their disadvantages, too.
Onions don't compete well against weeds; keep the onion patch well weeded. Beware, onion roots are shallow, so be careful not to disturb them while weeding.