When you edit a plant on your list, there is a box to check or uncheck labeled "Invite discussion from other members about this plant?" What does it actually mean when you invite discussion?

I think it allows comments by others to be made about that particular plant. If you look at one of you plants in your list you will see what to me look like an eye in a box.
If someone clicks on that they can post a comment about that plant.

Aw, I see that eye in the box. So it's a way to quickly comment about a plant on someone's list, like for trading or such. Thanks!

That's cool! I have been curious about that before too. I looked at about 100 plants on my list and about half of them had that turned on, half not. I turned on the ones that were off. Don't remember clicking that one way or the other in the past, so now I'm curious about that.

It would be handy if there was a way to make global changes to all plants in the list. Clicking each one is tedious.