Mr Emery, a resident of Vancouver, British Columbia, said he had made $3m (£2.4m) a year before his arrest in 2005.
Marc Emery allegedly sold millions of marijuana seeds around the world by post.
Mr Emery's wife, Jodie Emery, called on other marijuana activists to shut down Hastings Street, a busy corridor in Vancouver, in protest at his extradition.
He was ordered extradited by Canada's Minister of Justice Rob Nicholson on 10 May.
His seeds were allegedly traced to illegal cannabis-growing operations in Indiana, Florida, Tennessee, Montana, Virginia, Michigan, New Jersey and North Dakota, according to the US Drug Enforcement Administration.
Supporters of Mr Emery claim that Canada's Conservative government, led by Prime Minister Stephen Harper, is instigating a "culture war" by not intervening in his extradition.
Richard Troberman, Mr Emery's attorney, told the Associated Press news agency that his client would plead guilty to one count of conspiracy to manufacture marijuana in exchange for an agreed sentence of five years in prison.
“Thanks to an alert deputy and proactive policing, this criminal is now off our streets and any future plans he may have had to illegally grow marijuana have been thwarted,” Sheriff Randy Smith said.
Justice was arrested and booked into the St. Tammany jail on charges of possession of a clandestine laboratory, transportation of a clandestine laboratory, possession of Schedule 1 narcotics, and possession of a firearm in the presence of a controlled dangerous substance.
LACOMBE, La – A Florida man stopped by a St. Tammany Parish Sheriff’s Office deputy had what police describe as the “makings of a grow operation” inside of his vehicle.
The deputy found 70 bags of suspected marijuana seeds, individually packaged raw marijuana and THC wax, premium planting soil, ultraviolet lights, a portable grow tent, blower motors, PH testers, and a 40-caliber pistol inside the vehicle, according to the STPSO.
Twenty-two-year-old Raymond Justice of Bradenton, Florida, was driving along Bremermann Road in Lacombe on October 21 when a deputy conduction routine patrols pulled his vehicle over.
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According to troopers, Larkin told them that he placed the marijuana seeds in the pots to see if they would grow and that friends gave him the DOH signs. Larkin told troopers that the firearms were his.
According to the criminal complaint, troopers found eight marijuana plants growing in pots on Larkin’s deck while searching for the wanted man. Larkin also had 23 DOH signs estimated at $6,500.
A man was arrested after he allegedly was growing his own marijuana and had multiple Department of Highway signs that were stolen.
According to troopers, Larkin gave them permission to search the home. Troopers found multiple firearms, marijuana and multiple drug paraphernalia items.
According to the criminal complaint, State Police went to the house of Jonathon Larkin when they received a tip about a wanted person staying in Larkin’s garage on July 8.
Larkin was charged with manufacturing marijuana and possession of stolen property and is being held at Tygart Valley Regional Jail.