Tokyo Long Bunching Scallion

They call these Tokyo Long "bunching" onions.  I sowed 2 per hole, so does this mean if two come up, should I leave them both?   I thought scallions were grown like 16 per square foot.. each one spaced out 3 inches.

Also I sowed these Tokyo scallions 10 days before last frost, is that too late?   I also planted the chives 10 days before last frost.   Same with swiss chard.

I have these heirloom bunching onion seeds and have grown them for a couple years. Love them.

I sow them much more densely. I may sprinkle a couple dozen seeds in a 3"x3" area.

Non-bulbing onions like these can be sown very dense with good results. I have not experienced any drawbacks from the density, except for when I want to take four or five to use for supper and leave the rest to keep growing. Even then, it's not difficult to take just a few and I can start at an edge, grab what I need, gently pull and snip the roots just below the base, leaving the roots in place to decay and feed the soil food web, and off I go with just what I need.

Jennifer Lowery wrote:

Also I sowed these Tokyo scallions 10 days before last frost, is that too late?   I also planted the chives 10 days before last frost.   Same with swiss chard.

No, I don't believe so. If the seed is viable, they will grow.