This one is for a friend who has recently had some spooky plant experiences. That is plants that are spooky.
If you somehow don't know "Day of the Triffids" is a cheesy sci-fi movie from 1962. Mostly remembered for the shot of a pair of woman's shoes being spit out by a killer plant.
But before a shambling rubber plant monster chowed down on a scream queen "Day of the Triffids" was anovel by John Wyndham published in 1951.
This is the Del Rey edition first published in 1986. The cover art is by R. Courtney and shows that, unlike the 1962 movie, the triffids do not gulp down people whole. In the novel the triffids would kill you with poison and then wait for you to die so they could sink their roots into your rotting carcass.
If you simply must see a dramatic production of "Day of the Triffids" I would recommend the BBC miniseries from 1981. Or the 1962 movie if you just want to watch something fun and silly.