It’s no longer a secret. The rest of baseball is coming to understand the Mets have a special talent in Matt Harvey.

Twins manager Ron Gardenhire was the latest talent evaluator wowed by the 24-year-old Harvey, after watching him pitch in person for the first time on Saturday.

All Harvey did against the Twins was take a no-hitter into the seventh inning before finishing with a two-hitter over eight for his third straight victory to start the season. Harvey has a 0.82 ERA over that stretch.

“We were trying to figure out guys he reminds you of,” Gardenhire told The Post. “It would kind of be hard to place him because he is so poised. But his stuff is comparable to [Zack] Greinke because he can add and subtract with his fastball and his command of the strike zone and changeup and everything are all solid. Well above-average pitches, so he’s kind of like Greinke. ... I would be excited about him. That’s a nice looking young man and a good looking pitcher.”

The Mets and Twins were postponed yesterday by wintery conditions, including snow and rain — the makeup has been set for Aug. 19 at Target Field — moving Harvey’s next scheduled start from Thursday in Colorado to Friday at Citi Field against the Nationals. Another stud right-hander, Stephen Strasburg, is Harvey’s scheduled mound opponent.

But the Mets’ rotation could be thrown into flux depending on what happens over the next four days in Colorado, where weather is again expected to be an issue. Dillon Gee, Aaron Laffey, Jeremy Hefner and Jon Niese are the Mets’ scheduled starters against the Rockies.

Gardenhire said it was a legitimate concern to the Twins that Harvey would throw a no-hitter on Saturday. Justin Morneau homered with two outs in the seventh to end Harvey’s no-hit bid on a 35-degree day at Target Field.

“You take the weather and the whole package, the cold and him out there winging it like that,” Gardenhire said. “We weren’t catching up to too many. We didn’t square up too many balls, so absolutely, [the no-hitter] was a possibility.”