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Onion Expert

Late Season Onion Care Instructions

Blake Branen Rosencrantz - Wednesday, March 04, 2015

Over the last 5-8 years we have dramatically improved our ability to extend the storage-onion shipping season.  The combination of hearty storage varieties, cold storages, and sprout inhibitors means that many we can now supply onions from right here in Oregon for 10 months of the year.  However, with the advantage these better skinned varieties come with there are also a few characteristics that must be managed in order to minimize shrink and maximize profits.

Later in the season you may begin to see green specks in the center of the onions.  This little green speck is what we call an internal sprout.  This happens naturally as the onion goes through its life cycle and this is a very manageable issue.  If an onion is kept cool it will take, at least, several weeks for the internal sprouts to become external ones.

Here are a few pointers:

  1. Keep onions cool (35-45 degrees) (While these temps may cause a bit of translucency, don’t worry it will go away with just 12-24 hours at 45 or higher)

  2. Keep onions well ventilated, the more air the better (Our storages run 34-36 degrees and have constant air flow.)
  3. Keep onions dry (Our storages run 55-65% humidity.)

  4. If you have to choose between dry and warm or humid and cool….choose humid and cool

  5. Avoid sudden changes in temp as the papery skin will draw-in and hold moisture

  6. No room in the cooler, try air stacking the bags to allow air to reach the center of the pallet

  7. Plan on keeping onions for 3 weeks during the later part of the storage season… treat them a bit more like you might an apple.

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