RUN!

Seriously, if there are triffids around, that's the best thing to do. Seal yourself into a box. A triffid can kill you from 15 feet. It will. 1)2)

1)
They do make good components for potions and other herbalist stuff, though. And sells great on the Black Market. If you were to get that sting. . .
2)
Might or might not be a lie