Updated 8:19pm: The Fire Service has doused a scrub blaze at a Hamilton roundabout, which turned out to be a marijuana crop going up in flames.

They received a number of calls about the fire at the busy Avalon roundabout.

Their air brigade was sent to deal with it, and found three marijuana plants on fire.

They were quickly put out.

A Fire Service spokesman says when it comes to callouts they receive, it was certainly 'different'.