grow bag

Root vegetables aren't best suited to being grown in grow bags as they need depth and space to develop properly.

Tomatoes and Cucumbers are better suited for them. You could also put some Strawberries in them too.

Sweet bell pepper work well too.

As Redboyz says, onins need a bit of depth as the roots go down quite a way. I am restricted for open ground, so I grow my onions in large tubs. I also grow leeks and garlice, as well as potatoes in my large tubs. I have just used the last of last years onions and am still using the garlic.

Other long rooted crops I grow in tubs are carrots and beetroot. Lettuce, rads and spring onions grow well in shallower troughs

HTH

Ken