The triffids have a stinger inside their 'flower' type head... It has a range from around 3 metres, to 10 metres maximum... obviously the further away you are the less chance it will hit you... They also have very powerful roots, with which they both move and pull down their prey...
Also they spread very fast, and adapt even faster... methinks by this time Triffids might not be limited to just the planet of Serra Draconis
And yay, we might be starting the RP today