That looked a little suspicious to me, as in, there's no way in hell seeds could survive 2000 years drenched in water. They would have rotted long ago. But that could easily have been made up by the state-trained idiot who wrote the story for the state-controlled media in China. "Found it in a well. Wells have water. Therefore the seeds spent 2000 years submerged!"
I know they have survived in baskets underground, but ususally, any seed that is submerged or buried will rot in time. Unless the water is extremely cold, or perhaps in a peat bog. Even that is a little iffy in my mind. The passage of time would make a difference as well, meaning that seeds from 600 years ago would be more viable and identifiable than seeds from 6,000 years ago.