High Quality Content by WIKIPEDIA articles! The Day of the Triffids is a post-apocalyptic novel about aggressive plants taking over the world, published in 1951 by the English science fiction author John Wyndham Parkes Lucas Beynon Harris, under the pen-name John Wyndham. Although Wyndham had already published other novels using other pen-name combinations drawn from his lengthy real name, this was the first published under the John Wyndham pen-name. It established him as an important writer, and remains his best known novel. It has been made into one feature film (in 1962), three radio drama series (in 1957, 1968 and 2008), and two TV series (in 1981 and 2009). in 2003 the novel was listed on the BBC`s survey The Big Read.