When Shipwrecked-exclusive resources wither in the dry season, if you fertilize them they'll return to fully grown status. This will happen regardless of their previous state, i.e. grown or picked.
Steps to Reproduce
Find a withered SW-exclusive resource and fertilize it.
Find a withered SW-exclusive resource and fertilize it.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.