Reporting
There are many reasons for

There are many reasons for lack of bulbing. Is your soil rich in nitrogen? Onions are heavy feeders and need nitrogen at planting and while growing until they bulb up. Is your soil loose and crumbly--not too compact? Did you plant at the right time? This is often an issue. We don't know where you live, but June sounds late. Did you plant with the right spacing and not too deep? It they are planted more than an inch deep, they won't bulb up well. Did they get enough water to bulb? Please review this planting guide for more tips.