jmorth posted a comment and a photo on that thread yesterday. So that thread didn't show up on your home page "thread watcher?"
Have you tried looking at the box at the bottom of the thread, just under the last post? On the right hand side of the screen, there should be an option to either "Mark as unread" or either "Watch" or "Unwatch this thread." I'm watching that thread, so this is what it looks like on my screen:
And here's how it appears on my homepage when there's a new post:
What browser are you using?
Oops, just noticed that the first photo is of this thread, not the "strangest plants" thread. But still, you should see whether you have the option of watching or unwatching in that area.
