I'm seeing the same thing. I'm in Fallow and I see harvestable and withering:
Cloudberries
Blueberries
Raspberries
Sorrel
Nettle
Goldenrod
Dog pipe
Milkweed
so far.
This is happening in some tiles and not others. In one road section they're growing and "will be harvestable in a month" and in the next road section they're wilting.
I do have a few modifications with a few cooking mods and some additions to the cooking and diy, but the character is here next to some harvestable nettles and close to some wilting milkweed. 3.5 stable character.
http://s000.tinyupload.com/index.php?file_id=20668342719774963679**Update**
It appears that after it withers in Fallow, it becomes a non-withered harvestable plant of it's kind.
In the case of berry bushes / berries then if they had fruit and were wilting, they become non-wilting harvestable but if they had been picked while wilting, they become a normal "can be harvested after some amount of time"
I'm not accurately able to determine this, but it appears the plants that were harvested while wilting also spring back up as a "can be harvested after some amount of time" since I can now see some growing nettled yet harvestable non-wilting milkweed