It’s an amaranth… http://www.catnapin.com/WildFlowers/Weed/wzPigAmaranthTall.htm I grow amaranth as a trap crop for the cucumber beetles, and then use it as a nutrient accumulator by tossing them into my compost. There are a number of varieties that are planted as food / ornamentals. I don’t know if this plant is one of them… it looks like Palmer amaranth. You are supposed to be able to eat the leaves, and the seeds… personally… ima let the bugs eat them.