Its poplars and maples for me :) My scallions only get direct sun for half the day, so maybe thats why they're so slow. Dill in that same bed is doing well. Your onions should be bulbing by now. The days won't get any longer than this. At least they give a strong signal when they are ready to harvest. I usually leave them in until the leaves completely brown on the ground. The only worry is losing track of them after the tops are gone, but most of them have
bulged up above the soil line. In any case, all of the bulbing alliums should start browning in the next couple of weeks.
I have two sets of onion beds - fall planted sets and very early spring planted sets. All started bulbing at the same time. I suspect the fall planted ones are going to work out the best. But the experiment wasn't perfectly controlled. The cat rolled on the spring planted ones back in June. He found an interesting beetle in there one day.