FREE: Green onion seeds... also called bunching onions

Yes you can eat the whole plant, beneath the ground the onion is white. all you need to do is wash them then cut off the scraggly roots at the tip. The white portion usually is between an inch and an inch and a half long. The white is a little stronger in flavor than the green, you will often see slices of it in Salsa or on salads. I've added a photo of a couple of the onions after they have been pulled from the garden. I trim the roots, leaving just the tip on if I'm storing them in the fridge, if you are using them right away, completely trim away the roots.

The big plant is one I left from last summer. I always leave a few so they will get the flower that holds the seeds, this way they reseed themselves. The photo with the smaller plants shows what I planted in May, they should be ready to start pulling and eating soon. Normally if I'm starting new plants I plant around the end of March, to early April, just had weird weather this year.

Suzie, Are they getting at least 8 hours of sun daily? and regular watering? it's possible that your planter box isn't deep enough or that you planted them too close together, if you plant them close together it's always a good idea to thin them out a little. With all the rain we got late in the season, things are taking a little extra time to mature.... give them time, don't give up. Yours may not be ready to later this summer.