Recs if you like Hothouse...

Fiction books featuring plants as a major theme. For the purpose of this list, fungi are honorary plants! All fiction genres here (though I am primarily a fantasy reader, so suggestions most welcome!)

Books featuring spores, molds, and fungi. Suggestions welcome.

books where mycology takes over in horrific/fantastical ways

Science fiction books in english published between 1960 and 1969 (going by when it was published as a book, generally).