black plants are mainly foliage plants -basically the term 'black plants' is used to denote anything but green. It's an umbrella term for dark plants and does include near black flowers. Description taken from the International Black Plant Society and the book "Black Magic and Purple Passion".

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)