Today there is an educational organic farm about 1,500 ft away from where the wheat was grown: The Urban Farm in Battery Park http://thebattery.org/destinations/urban-farm/
And there are hundreds of community gardens across the city that are maintained by neighbors and supported by the Parks Department.
Bonus: A time capsule was also part of the piece, set to be opened in the year 2979 http://www.agnesdenesstudio.com/works7.html