Can't really tell anything from your photo. Can you get closer to a leaf? It looks like more than one plant, but I can't tell if they are all the same. What did you have planted last year? Did you take any photos that you can compare with these?
Hmmm... did you post this twice or did my reply not save?
In any case, that's pigweed, (Chenopodium album), a rather tenuous weed that is edible and tastes like spinach only grainier - also has a slightly strange aftertaste that spinach doesn't. It's also known as lamb's quarters or wild spinach and is a favorite host of leaf miners.
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