Sunflowers too eh? I think I should look deeper into this whole business and wee how much study has been done- how widespread that form of chemical aggression is in nature... I felt a bit foolish when the opposite, mycorhizal symbiosis, turned out not to be just an orchid thing, but practically everywhere. (I really ought to have known- after all fungi are ubuquitous, and crucial in so many ways.)
Thanks Cathy. This is turning out to be a fertile thread- kudos to whoever started it... Oh look: it was me! Oh dear!