Emile Hirsch

"Into the Wild" star Emile Hirsch has a soft spot for potted plants, because he kindly watered one on Sunset Boulevard -- with his pee! Hey, when you gotta go ... don't go in front of cameras. Check out TMZ on TV -- click here to see your local listings!

With a functioning bathroom just feet away, "Savages" star Emile Hirsch relieved himself outside a West Hollywood nightclub last night ... surrounded by strangers ... directly onto an innocent cactus. AND HIS FACE IS PRICELESS. Hirsch was outside Bootsy Bellows nightclub on the famous Sunset Strip…