I recently found out that you can blacklist certain plants for the whirlisprig so that it stops producing drops from them. This is really helpful! It lets me plant things I don't want to farm to make my whirlisprig happier.
Unfortunately the blacklist is pretty long and I wanted to add back in a certain plant that I now need. I no longer have the scroll that has every blacklisted plant on it and was hoping there was some way to remove one plant from the blacklist. If this isn't already a feature, it would be really nice to have for whirlisprigs and starbies as well. The closest method I have found is to destroy the whirlisprig flower and make a new one.