Key Attributes

Sun
Sun: Full Sun
Packet
Packet: 200 Seeds
Days To Maturity (# Days)
Days To Maturity (# Days): 122
Botanical Name
Botanical Name: Allium cepa

Caliber, (F1) Onion Seeds

Caliber is a late-season yellow long day for the western United States known for vigor, disease resistance, yield, and storage capabilities. Caliber is a Celebrate hybrid with a healthy plant with solid roots and strong and erect tops that assist in providing thrips tolerance and make applications easier. Caliber has a consistent rich bronze scale in super colossal bulbs with single centers that do very well with a mechanical harvest. Caliber has a reputation for storing very well long term. Disease Ratings: HT to Pink Root and Fusarium, T to Bolting and HT for Thrips
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Key Attributes

Sun
Sun: Full Sun
Packet
Packet: 200 Seeds
Days To Maturity (# Days)
Days To Maturity (# Days): 122
Botanical Name
Botanical Name: Allium cepa

Product Details

Weight

0.008

Depth

0.1

Height

4.5

Width

3.25

Plant Height

4-8"

Botanical Name

Allium cepa

Seed Type

Seed

Seeds Per Gram

223

Seeds Per Pound

101,300

Row Spacing

12-18"

Packet

200 Seeds

Sow Depth

1/4"

Disease Resistance

PR, FW

Seeds Per Ounce

6,331

Fruit Color

Yellow

Breed

F1 Hybrid

Sun

Full Sun

Types

FULL SIZE ONIONS

Growing Conditions

Long Day Onion (Northern States)

Life Cycle

Annual

Sow Method

Transplant, Direct Sow

Plant Spacing

3-4"

Categories

Onion

Germination

11,12,13,14,15,16,17,18,19,20,10

Days To Maturity (# Days)

122

Seeds Per Acre

6 lbs

Components

Growing Instructions

    Learning Download: How to Grow Onions

There are different kinds of onions, such as short-day onions which grow best in the south and long-day onions which grow best in northern climates. Pick the correct variety for your garden.

Before Planting: Onions require full sun and fertile, well-drained soil with a pH of 6.0-7.0. Sandy loam soils with good moisture retention are recommended. Add some peat moss can help with moisture retention.

Planting: For direct seeding, sow bunching onions at 24 seeds/foot and bulb onions at 12 seeds/foot, 1/4″ deep, rows 12-18″ apart. Thin bunching onions to every 1″ and bulb onions to every 4″. In short-season areas, for transplanting sow seeds indoors in flats in late February to mid-March. 2-3 seeds per cell and thin when 2″ tall. Tops may be clipped to 5″ tall. Transplant to the garden 1″ apart for bunching and 4″ apart for larger bulbs.

Watering: Onions are shallow rooted and grow best with at least 1″ per week of rain or irrigation, especially during the bulbing phase.

Fertilizer: Upon planting, add compost to the soil, but since onions are heavy feeders they will grow best if fertilized throughout their growth. Also, add a timed-release granular 10-10-10 or 12-12-12 fertilizer to spread in the soil. Using a nitrate-based fertilizer will make the onions sweeter at harvest.

Days to Maturity: Onions are ready to harvest when the green tops flop over, but they can also be harvested quite early as green onions. For the full onion, once the tops flop over, wait for a dry day to complete the harvest. (See each variety for days to maturity)

Harvesting: When necks become soft and tops are falling over, pull and sun-cure at least 2-7 days, depending on weather. Move to a protected location to finish drying. When dry, clip off tops and roots and store in onion bags or shallow boxes at near freezing and 65-70% humidity.

Tips: Onion bulbing is triggered by day length, and maximum day length during the growing season increases from south to north. Short-day onions are grown at lower latitudes in the South, while intermediate and long-day onions are grown at higher latitudes. Refer to “Adaptation” in each variety description for details.

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Our Seed Promise

"Agriculture and seeds" provide the basis upon which our lives depend. We must protect this foundation as a safe and genetically stable source for future generations. For the benefit of all farmers, gardeners and consumers who want an alternative, we pledge that we do not knowingly buy or sell genetically engineered seeds or plants.

The mechanical transfer of genetic material outside of natural reproductive methods and between genera, families or kingdoms, poses great biological risks as well as economic, political, and cultural threats. We feel that genetically engineered varieties have been insufficiently tested prior to public release. More research and testing is necessary to further assess the potential risks of genetically engineered seeds. Further, we wish to support agricultural progress that leads to healthier soils, to genetically diverse agricultural ecosystems, and ultimately to healthy people and communities.

To learn more about the "Safe Seed Pledge" please visit www.councilforresponsiblegenetics.org.