Here is the existing topic: EA Answers.
Sonad, that link just redirects to this very page.
I am having a similar issue as OP, except I can't even get a Gardening Tab on my Notebook to present itself in the first place, no matter how much I research. No tab, no entries.
It is not :D It goes to old topic and our messages are merged with it, at least for me! Anyway, just in case, the topic from January is: 'Researching some plants does not result in notebook entry'.
Your issue sounds like a new bug unfortunately, I suggest creating a new topic for it.
Hi @KJustinR do you get a notebook entry if you research other plants too?
