At the Dover Farm, I was wading out into the field to pick some cherry tomatoes, and noticed this plant with distinctive arrow-shaped leaves. It’s Buckwheat! Cultivated as a crop, but this one is an escapee. Buckwheat has been grown as a crop in the U.S. since colonial times for livestock feed and for flour. Also a honey crop (used to supply nectar for bees) and a smother crop (a quick germinator that creates a dense leaf canopy to smother weeds).
Buckwheat (Fagopyrum sagittatum)
Bonus picture to contrast with the farm: we were just in Manhattan. Drive-by shot of a grocery store in the Washington Heights neighborhood that is open to the sidewalk. It’s the sort of colorful outdoor display where you expect produce… but it’s all cans.