I can't make any sense of this plant in the Food Garden, but in an area that has some ornamental plants. I don't even know if this is ornamental or a food plant. In habit, it reminds me of Impatiens, so Balsaminaceae, the flimsy-looking opposite simple leaves, small clusters of single flowers, coarsely serrated margins resembling those of Impatiens capensis. But I think there are no spurs on the flowers, which look wrong for that genus anyway. The flowers look a bit like Convolvulaceae, completely fused smooth petals. The buds look like Malvaceae, sharp edges coming to a point. The stems are thick like Curcubitaceae, but this is not a vine and there are no tendrils. I'm not finding anything in any of these families that looks like this.
It looks just like that, has the sparse hairs on the stems and blue anthers as described at Tomatillo. Thank you! Solanaceae.
I see on Wikipedia that Physalis ixocarpa is a synonym. The page at ITIS Standard Report Page: Physalis philadelphica shows Variety Physalis philadelphica var. immaculata Waterf. – Mexican groundcherry Variety Physalis philadelphica var. philadelphica Lam. – Philadelphia groundcherry
Wow. These must have been planted a lot later than yours. Maybe they replaced something already harvested.