While his fellow castmates were celebrating the $100 million opening-day box office success of [movie id="307087"]"Harry Potter and the Half-Blood Prince,"[/movie] Jamie Waylett was in a London court on Thursday pleading guilty to growing marijuana, according to The Associated Press.

Waylett, who has played Hogwarts bully Vincent Crabbe in all of the six "Potter" films, was originally [article id="1608823"]busted in April[/article] after police searched a car he was riding in and discovered eight bags of marijuana and a knife. Police then raided his mother's home and found 10 marijuana plants. The cannabis was reportedly worth approximately $2,900 and was growing under hydroponic lights, next to a PlayStation console.

Along with a friend, the 19-year-old Waylett pleaded guilty to growing the drug at a hearing at City of Westminster Magistrates' Court. The charge carries a maximum sentence of 14 years. Judge Timothy Workman announced that the two men would be sentenced Tuesday.

In "Potter" lore, Crabbe is a dim-witted Slytherin student who becomes one of Draco Malfoy's accomplices, assisting with mischievous undertakings and generally intimidating classmates with his physical girth. Eventually he becomes a powerful wizard who is loyal to the nefarious Death Eaters.

Waylett was initially considered for the role of Harry's cousin Dudley Dursley, but landed the part of Crabbe after an extensive casting call before 2001's "Philosopher's Stone." He has not appeared in another film beside those in the "Potter" franchise.