The “Weed Man” of Times Square wants the cops to stop harshing his mellow.

Joshua Long — who drums up donations with a sign saying “Help! I Need Money For Weed!” — sued the city today over his repeated arrests at the Crossroads of the World.

The popular panhandler from Brooklyn says that while he’s careful not to break any laws, his First Amendment right to “peacefully” hold his sign is routinely violated with charges of “allegedly illegal conduct.”

His Manhattan federal court filing seeks unspecified money damages and a court order barring cops from telling him to “move along” or arresting him without “probably cause.”

“Without an injunction, it is virtually assured that the NYPD will continue to violate Mr. Long’s constitutional rights,” his suit says.

A spokeswoman for the city Law Department said: “We’re awaiting formal service of the papers and certainly will review them upon receipt.”