This is frustrating... I have plump helmets and pig tails withering in the fields next to an empty plant stockpile. I have marked my farmer as specialized labor but he just sits in the gathering place with No Job. I've also tried creating a custom work detail that's only Food Haulers and assigning a specialized dwarf to that labor detail, but they still won't harvest.
The harvest plant stockpile has everything excluded except for the subterranean crops: quarry bushes, pig tails, dimple cups, plump helmets, cave wheat, and sweet pods. But no matter what I grow, nobody will take the crops off the farm plot. They'll plant new seeds under the crops as they wither. The harvest stockpile is empty except for an empty barrel, and I have plenty of other empty barrels. I also tried reducing the harvest stockpile's allowed barrels to zero, thinking maybe it had something to do with conflicting container tasks, but it didn't make a difference. Also, I noticed that the max barrels had been reset to the size of the stockpile the next time I looked, so maybe that's bugged at the moment?
I've also tried forcing the plants to be used in tasks like brewing and processing, but I gathered a bunch of plants and haven't gone to the length of forbidding every plant except the crops yet.
I've also tried toggling the farming labor between "Only selected do this" and "Everyone does this".
Any ideas what I'm doing wrong? This is kind of a showstopper for any fortress!