Thanks for passing by, @lemouth. I'm glad you learnt some few things from the post.

I was not imagining plant’s chemistry so complex. Can you please point me which one of the reference is the research article detailing that? Thanks in advance!

Yes, I really appreciate this question. Truly, some plants have been found to recognise the pollens of close plants and theirs and can as well prevent them from growing well so as to avoid self-fertilization. However, you can check the links below for detailed explanation on it.

Link 1
Link 2

Thanks for coming, once again.