Bunnings is facing 45 charges of misleading the public over its tagline "lowest price guaranteed" promise.
The Commerce Commission, which laid the charges, says in the court documents a number of its slogans were liable to mislead the public into thinking the DIY chain's prices were the lowest on the market "when they were not".
The charges were laid by the consumer watchdog in December.
The alleged offending took place between June 2014 and February last year and involved print, radio and television marketing campaigns, in-store signs, staff uniforms as well as its website.
Some of the taglines named by the Commission as being "false or misleading" were: