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10.
A person put in place(hence 'Plant') to divert things. Plants are used to divert movements, plans, plots, or whatever an opposing force wants to stop. Using a plant is a clever way of destroying an opposing movment without seeming suspicious or have to get you hands dirty. Sometimes plants are sent my one group to an enemy group to act as if he/she is part of the enemy group and try to gain influence just to mess the group up, or make them look bad. If democrats wanted to make republicans bad, they could use a plant that fakes like a republican and tries to make republicans look bad, and in turn make the democrats look better, even though the plant is playing a part prompted by the democrats. Or say if you playing a competitive game, and the opposite team sends in a plant to your team, acting as a friend, but he/she is really there to mess your team up and divert it so that the other team(who placed the plant) wins.
Figures that Jason was a plant, it seemed as if his whole point was to disband our protest from the beginning.
by ShadyGrape February 29, 2012
 
1.
1. A male or female that does not have sexual ambitions. 2. The person standing at the corner of a bar not socializing. 3. Asexual
That fool over dar doesn't hit on da bitchez, he hasn't had a piece in years. He's a plant.
by no dozin August 29, 2010
 
2.
A movie critic; one who is paid off from a major movie studio to give a fake positive fluff review. Sometimes the said "critic" doesn't even exist at all, and is just a fake name with a fake quote. Studios use this tactic as damage control for a potential flop.
"The 3% of critics who gave positive reviews for Battlefield Earth on Rotten Tomatoes definitely had to be plants from Warner Bros. studios. No one could ever voluntarily praise that movie without being bribed. "
by Dr Claw April 24, 2008
 
3.
Plants are stupid things that are green.
Phil: hey look at those plants
Jeff: Wow, thats stupid
by Captain John_smith July 14, 2006
 
4.
that green shit yo momma be waterin
go water that plant yah negrah!
by bbc August 26, 2003
 
5.
an agent of misinformation, placed in a group to deceive, distract, or provoke
That man who keeps starting drama, seemingly for no reason, is suspect of being a plant.
by truthypants November 12, 2011
 
6.
1: V. To place incriminating evidence in a place likely to be found by the authorities.

2: N. A green organism, often leafy, popular for its ability to turn poisonous gasses into the popular hallucinagen, oxygen. These blobs of cells are well known for causing rashes, indegestion, death, and putting holes through the feet of unwary hikers. They are to be watched carefully for signs of rebellion.
Wanting to break my coke addiction and put an innocent man in jail for shits and giggles, I decided to plant seventeen kilos of my stash in in a stranger's house and call the police from a payphone.
by Shuffle September 13, 2005
 
7.
Used in the entertainment business, when someone accomplish something with a "help" or a "connection" with someone from the inside.
"The reason he won that contest, was because he was a plant."
by Gillima April 16, 2008