Knight said due to its location, it was too dangerous to fight the blaze last night and crews monitored the fire overnight before returning to the scene this morning.
He confirmed the fire was contained by 11am on Sunday.
Crews also responded to 11 other small fires on roadsides and in gorse in the Selwyn District overnight.
Police confirmed to the Herald that they were investigating the incidents.
“Fortunately, there have been no reports of damage to buildings or any injuries.
“Inquiries are under way to identify and locate the person or persons responsible for setting the fires.
“If anyone has information which could assist, they’re asked to contact police via 105.”
Information can also be provided to Crime Stoppers on 0800 555 111.