I have grown squash in earthboxes for a few years now, and I have not been entirely thrilled with the results. Using the earthbox quidelines of 4 per box, I always got anemic looking plants. They did produce squash, but not as much as I would hope for.
This year, I put one plant per box, right in the middle of the box.
What a difference that made!
As you’ll see in the picture, you can’t even see the box – you’ll have to trust me, there’s an Earthbox under that foliage.