Plants Chock Full of Vitamin D-eath!

This recent post got me thinking about plants:

 

Talking Trees and Killer Spores: The Flora of Science Fiction and Fantasy

Under normal circumstances, plants really aren't that scary (or that fascinating, to be perfectly honest).

Sure, there are a lot of poison ones (like the Bittersweet Nightshade that spontaneously grew in my back yard) and irritating ones (poison ivy, stinging nettles).

There are even carnivorous plants. I have some pitcher plants I grew from seed.

And yes, I know it's a horrible picture. But dammit, Jim, I'm a writer, not a photographer.

But we can generally avoid the poison/irritating plants if we're careful, and the carnivorous plants are too small to pose a threat to us.

But with a little imagination . . . plants can be horrifying.

In an episode of the Tremors television series, Perfection Valley was infested with acid spitting plants;
The Happening was about plants getting their revenge (in a passive, I don't-know-if-I'm-really-all-that-scared kinda way);
The Ruins centers on carnivorous vines at an archaeological site;
In  a Creepshow short, Stephen King trades his man-pelt for an eco-friendly shade of green when a meteor brings down a creeping crabgrass.

So what about you? Any plants (real or imagined) that have their roots in your nightmares?