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Vegetable (Cool Season) - Onion Family
Also known as scallions, bunching onions, green onions
Allium cepa var. cepa
Alliaceae Family
Whether harvested early for scallions (green onions), for summer meals,
or winter storage, onions need rich, well-drained soil and good weed
control. Tightly spaced green onions fit well in ornamental plantings.
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Site Characteristics
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Sunlight:
Soil conditions:
- requires well-drained soil
- requires high fertility
Well-drained, rich soil, high in organic matter, neutral pH. Optimum pH
is 6.2 to 6.8. Requires plentiful, even moisture for good yields.
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Plant Traits
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Lifecycle:
annual
Biennial grown as annual.
Ease-of-care:
moderately difficult
Easy if you have rich well-drained soil and good weed control.
Height:
1 to 3 feet
Spread:
0.5 to 1 feet
Bloom time:
mid-summer
Usually
does not flower unless grown from sets that are too large (more than �
to � inches in diameter), or young plants (direct seeded or
transplanted) are stressed by abnormally cold weather.
Foliage color:
medium green
Foliage texture:
medium
Shape:
upright
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Special Considerations
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Tolerates:
Special characteristics:
- not native to North America
- Unknown in wild. Probably originated in the Middle East or Asia.
Special uses:
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Growing Information
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How to plant:
Propagate by seed - To grow your own onion sets, sow seeds thickly in a
block in midsummer. About 2 months after planting, roll down the tops,
forcing the plants to form small bulbs. (Those about the size of a dime
work best.) After tops dry, clip them off, leaving about � inch of
stem. Cure and store in a cool, dry place as you would onions for
eating. Plant your sets the following spring.
Germination temperature: 45 F to 95 F
Days to emergence: 4 to 5
Seed can be saved 1 year.
- Longer if stored properly in cool, dry location.
Maintenance and care:
Can be direct-seeded, grown from transplants started inside, or from
sets -- small bulbs about �-inch in diameter grown from seed the
previous season. Choose
a weed-free, well-drained location. Raised beds are ideal. Onions are
good for intercropping with other garden plants, especially
early-maturing spring greens. Do not plant where other onion family
crops have been grown in the past 3 years. Direct-seeding in the
garden may not allow enough time for long-season varieties to mature,
but is fine for shorter-season varieties or for scallions - onions
harvested before the bulb forms. Direct-seed in spring when the
soil reaches 50 F. Plant seed � inch deep, � inch apart, in rows 12 to
18 inches apart. Thin to 4-inch spacings for large bulbs, 2-inch
spacings for smaller bulbs but higher yields, or 1-inch spacings for
scallions. Start transplants inside about 8 to 10 weeks before
last frost date. Plant 4 or 5 seeds in each cell, or seed in flats �
inch deep and � inch apart. If tops grow too tall and begin to droop,
trim back to about 3 inches tall with scissors. After hardening off,
transplant 2 to 4 weeks before last frost date. Space 4 inches apart
for large bulbs, 2 inches apart for smaller bulbs, or 1 inch apart for
scallions. From sets: Choose bulbs no larger
than � inch in diameter. Large bulbs are more prone to bolting. Plant
sets about 1 inch deep 2 to 4 weeks before last frost date. Space 4
inches apart for large bulbs or 2 inches apart for smaller bulbs. Onions
have shallow root systems and need consistent moisture and good weed
control. Water weekly if weather is dry, and mulch to retain moisture
and suppress weeds.
Pests:
Onion maggot - Locate new plants in a part of the garden different from
previous year's location. Use floating row covers to prevent
infestations.Thrips
Diseases:
Purple blotch (Alternaria porri) and Botrytis leaf blight - Avoid
wetting foliage if possible. Water early in the day so above-ground
plant parts will dry as quickly as possible. Avoid crowding plants.
Allow space for air circulation. Eliminate weeds around plants and
garden area to improve air circulation. Practice plant sanitation: when
plants are not wet, carefully remove or discard affected plant parts.
In autumn, rake and dispose of all fallen or diseased leaves and bulbs.
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Varieties
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Browse onion varieties at our Vegetable Varieties for Gardeners website.Choose
long-day varieties which need about 14 hours of light to form bulbs.
Short-day varieties, such as the famous Vidalia onions, grow best in
the South. Spring-sown early varieties can be harvested just 60
to 80 days after planting. Storage varieties require 90 to 110 days to
mature from direct seeding, and come in yellow, white and purple
varieties. Sweet or milder varieties do not store well, and should be
eaten soon after harvest. Pearl onions (sometimes called cocktail
onions) have small bulbs (great for pickling) that mature in 60 to 70
days. Green or bunching onions (sometimes called scallions) don’t
form bulbs. Harvest them for their greens and small blanched
below-ground stem usually 65 to 75 days after direct seeding. Some are
a different species altogether, Allium fistulosum. Some varieties recommended for New York include: From transplants (Not for long term storage): Ailsa Craig Bennie’s Red Candy Red Sweet Spanish Walla Walla (mild) White Sweet Spanish From seed (early-maturing): Arsenal Early Yellow Globe Precedent From seed or transplants (long-term storage): Duration Fortress Mars Redwing Sets: Stuttgarter Green or Bunching: Evergreen Hardy White He-Shi-Ko Long White Bunching Southport White Bunching
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