There are quite a few different problems that onions can have... so far I've been fortunate to only have one "pest" that has damaged my plants! (Ziggy the cat enjoys rolling on them
) I have more plants started that I'm going to put in the ground in my hoop house after the tomatoes are done, to hopefully harvest as scallions in the early winter; and also have ordered some sets of a variety called "Forum" from Johnny's that I'll plant in the larger greenhouse to overwinter and, presumably, harvest early next spring/summer. Only time will tell how successful these plans will turn out to be, although a few years back I did save some of the sets that I bought locally in the spring, planted them in the early fall under a "low tunnel" of clear plastic over PVC hoops, and harvested a lot of what I called "bonus onions" the next spring - so I think fall planting the sets in the GH should work well.