I don't know if you guys ever tackled this but my stars, this book was terrifying to me. I found it in my Catholic school library when I was 9 and it has photos in it that look like stills from some movie you'd see when you were home alone.
Basically a whole town gets infected by a strange fog and the people start slowly turning into plants, they get strange marks on their face and at one point they find a woman that has completely turned into a cactus. It's really effectively done.
Like a lot of things produced in the 1970s, it has a real downer ending as well.
Cheers!
Brian
UNK SEZ: Thanks Brian for turning us on to THE PLANT PEOPLE! If there is anyone out there who has never visited PLAID STALLIONS before, let me just say I'm jealous of you because you are about to have the time of your life. Traveling to PLAID STALLIONS is like diving into a pool of non-stop nostalgic awesomeness and your cherry trip is an unforgettable one. Jump in HERE!