Matt Conti runs down all the proposed developments for the Greenway - mostly all completely unfunded. One of the projects, which would replace the shelved plan to build a Boston museum atop a series of ramps, would consist of an "urban nursery," in which:

Trees would be planted in pots along rows, as if in a real nursery. After a period of time, an entire row would be "harvested" for use in other locations.