Well, it is known that certain plants grow better when beside one another, such as, I think it is marigolds, which help protect vegetable plants from infestations. Also, I once had a gardenia and one other houseplant, can't remember which one it was, but next to one another they always did well; if I separated them, same window, same amount of light, etc. just apart with one or two other plants in between, they got droopy, sick, lacklustre, etc. Back together and they would perk right up. So...they were quite social with one another.

I know there are plants in the forests, here, which help one another to grow, being sociable in nature's own way. Makes sense to me!:-)