Vegetables Onions Onion Plants Forum


(F1) Onion Sets

Product ID: 2520

The earliest bulb onion.

Can be planted in the spring for a "green top" cooking onion by the beginning of July and a dried bulb by the end of July. Fills the gap between last year's storage onions and this year's crop from seed. Not for long storage. Best at 37° latitude and higher. Onion sets are shipped by USDA hardiness Zone March-May starting in the South. Sets avg. 14-17mm. Avg. 150 sets/lb.



100 Units

In Stock

500 Units

In Stock

1,000 Units

In Stock
Add to Wishlist

Additional Information

  • This product does not ship outside the United States.
  • This product does not ship to the following states: ID,  AS,  AP,  AE,  AA,  GU,  MP,  PR,  PW,  VI,  MH,  FM.
Onion sets ship weekly from late February through mid April. Add item to cart and enter your shipping zip code to select from a list of available ship dates for your plant hardiness zone. If you wish to choose a ship date earlier than the recommended dates you must place your order by phone (1-877-564-6697). Physical address required for delivery (no PO Boxes).
Forum onion sets will be shipped 3-4 weeks before the last frost date of each region, dependent on the weather. Shipments will be delayed if it is very cold and there is a risk of freezing in transit. Upon arrival, onion sets should be taken out of the box for ventilation, and kept dry and cool but not freezing. Moisture and heat will cause the sets to sprout prematurely. The more airflow, the better. Hanging the bag of sets up in a garage that does not freeze is very good. Hanging the bag with a fan on it is ideal. Large amounts of onion sets can be set on a pallet with a fan. Forum can be planted as early as the soil can be worked in the spring, ideally before the last frost date. Plant bulbs individually or drop the sets into a shallow trench and cover them up. If sets are planted individually, make sure to plant them root end down. If the trench method or a mechanical transplanter is used, the football-shaped sets will fall on their sides and right themselves as they grow. Either way, make sure that onion sets are covered well enough that the growing point will not freeze. One to two inches deep should be plenty, depending on local conditions. Forum sets should be planted two inches apart in the row. The onions will get bigger than two inches around, and they will jostle each other in the row as they bulb. Sets can be planted closer than two inches apart, the plants that are too close together can be thinned out and used as bunched green onions or partially bulbed grilling onions. Planting Forum in cool soil encourages root development. Then, when the soil warms, shoot development is promoted, and the plant already has a good root system to feed the growing top. Yields will be compromised if Forum is planted late into warm soil. After planting, culture is the same as any transplanted bulb onion. Forum is a long day onion and will not grow well below 37 degrees latitude. For this reason it should not be grown in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Arkansas, Mississippi, Louisiana, Oklahoma, Texas, New Mexico, Arizona, and far southern California. Forum will bulb up roughly ninety days from when it was planted. For many growers, this will mean that they can have a green-top (uncured) bulb onion by around the Fourth of July, and a dried onion a few weeks later (as long as the curing process takes). Forum produces a medium-sized yellow cooking onion. Considering that most cooking onions in northern areas are not bulbed and cured until September or October, this is very early! Forum is not a storage variety. The bulbs can be expected to last for three months from the time they are dried, so best to plant only as many as can be sold or eaten within that time frame.

Johnny's is committed to your success, every step of the way.

We want you, our customer, to be 100% satisfied with all of our seeds, tools, and supplies. 

If anything you purchase from us proves unsatisfactory, we will either replace the item or refund the purchase price.

Quick Facts

Latin Name
Allium cepa
Days To Maturity
Average number of days from seeding date until ready for harvest.
90 Days
Life Cycle
Plants can be Annuals (single growing season), Perennials (grow year after year), Tender Perennials (grow year after year in warmer climates; and in some cases when given special protection in colder climates), or Biennials (require two years to mature).