|How do I make red onion bulbs grow to be large like in the store.|
|One important thing to remember about onions is that there are two different classes: long-day and short-day onions. Long-day onions are more appropriate for northern states because they are adapted to longer days. Southern states should use short-day varieties of onions. When you go to your nursery, they will usually list long-day onions as L and short-day onions as S. Short day onions develop bulbs with an average of about 12 hours of daylight. Long-day onions form bulbs with more sun, around 15-16 hours of daylight. You should grow the kind of onion appropriate for your region to ensure proper maturation of the onion bulbs. Red onions are long-day onions so they new 15-16 hours of daylight in order to form bulbs. You didn't mention where you live so it's possible that your region is better for short day onions.|
Hope this clarifies things for you!