Vegetables Onions Onion Plants


Spring (F1) Onion Sets

Product ID: 2520

Early bulb onions from spring planting.

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. Sets avg. 14-17 mm. NOTE: Forum sets are small, dry immature onions bulbs grown the season before. Also suited for fall planting in the North for overwintering. For fall planting, order Forum #2520F. Avg. 150 sets/lb.



100 Units

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500 Units

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1,000 Units

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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.
Spring 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).
CULTURE: Onion sets should be planted as soon as possible — ideally within one week of receiving them. If you cannot plant immediately, store in a cool, dry, and dark place with good ventilation. Onions require a fertile, well-drained soil with a pH of 6.2-6.8. Sandy loam soils are ideal, so raised beds or raised rows are recommended for heavier soils to promote soil drainage. Full sun is required for optimal growth. Onions require frequent irrigation and the equivalent of 1" of water per week.
PLANTING: Plant sets in early spring, as soon as the soil can be worked. Plant approximately 1" deep with the base of the bulb (root-end) facing down, 4" apart in rows 12-18" apart.
DISEASES, INSECTS & WEEDS: Adequate air circulation aids in reducing the risk of foliar disease. Thrips are the most common Allium crop pest. Reduce overwintering habitat by keeping fields free of weeds and debris. Controlling weeds is also critical to the success of your onion crop.
HARVEST: Necks will become soft and tops will begin to fall over when mature. When approximately 50% of the tops have fallen over, pull the onions out of the ground and let dry in the sun for 2-7 days. When foliage and necks are completely dry, clip roots and cut back tops to 1". 'Forum' is not a long-storage onion, but if properly cured will store for approximately 3 months.

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Quick Facts

Latin Name
Allium cepa
Days To Maturity
Average number of days from seeding date to harvest, within a specific crop group. If a transplanted crop: average number of days from transplant date. Not sure if crop is direct-seeded or transplanted? Check the Growing Information box for details. If crop can be both direct-seeded or transplanted, days to maturity refers to direct seeding. Days to maturity for all flowers and herbs is calculated from seeding date.
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).
Hybrid Status
Hybrid: The offspring of a cross between two or more distinct parent lines, usually of same species, and selected for improved traits.
Open-pollinated: A non-hybrid variety that can reproduce itself in kind, demonstrating relatively stable traits from one generation to the next.
Hybrid (F1)