Many things in the garden are still new to me, such as when to harvest onions. I did a search on the internet, and found out that any time is the right time to pick them. The key to a good long lasting onion is how you harvest it. Here is a very good explaination from the National Gardening Association. The basic idea is to allow the bulb time to “cure” so that it will not rot in storage. Above you can see four types of onions I’ve started this year. Some are doing better then others, and I suspect the placement of manure is the reason. I’ve placed a brick into the picture area to show size.
After reading the tutorial, I pulled one onion, and let it sit in the sun for a day. On the left of the photo above, is the first onion set out, and the right onion was freshly picked. Notice the changes to the roots ? In the left, they have started to wilter and dry, whereas on the right they are still healthy. This is an important step, and I really recommend visiting the Garden.org site mentioned above. Last year, I had not known about this process, and all of my onions were rotten before Christmas.