Selection
and Growing Information:
Your
geographical location will need to be considered as you select your
onion seeds. There are three main types of onions — "short-day", "intermediate-day", and
"long-day" varieties. Onions require specific balance of
daylight to darkness to perform properly.
The genetic makeup of the particular onion variety is what signals
the plant to stop vegetative growth and to start forming the bulb.
As the onion matures, the tops will eventually fall and touch the
ground, at which point the onion is ready for harvest.
Short-day
varieties are recommended for the southern U.S. where the temperatures
are typically warmer year round. They will make bulbs earlier in
the year with only ten to twelve hours of daylight. If grown in the
north, they will tend to shut down their vegetative growing and bulb
resulting in small, pearl onions.
Intermediate-day
onions typically need twelve to fourteen hours of daylight to trigger the bulbing
process. They are suited for most areas.
The long-day
varieties are best suited for the northern states as they need fourteen to
sixteen
hours of daylight to bulb. In the south, they will grow nice green
tops but not bulbs - like bunching onions. Long-day onions are generally more pungent and
store better.
Plant
seeds early in flats, a couple of months before you intend to plant in the
garden. The tops will get spindly so use scissors
and prune back to two to three inches tall. You may need to do
this a few times before transplanting time. Don't through
the clippings away. They make a great topping for a baked
potato or flavoring for a soup recipe or salad. When the
soil can be worked, transplant two to four inches apart. It is
very important to keep weeded. The early growth of the
allium
plants is very important.
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