He-Man and the Masters of the Universe (2002) 1x19

When Orko's role of overseeing the gardens at the Royal Palace proves to be a lot more difficult that he first expected, he journeys to the Evergreen Forest to seek out Moss Man. Orko takes some seeds from a strange creature who claims to be Moss Man, only to have the resulting vines overthrow the Royal Palace and capture everyone inside! When the real Moss Man appears, Orko learns that the strange creature he aided was in fact Evilseed!