The Electoral Commission has ruled that a hedge pruned in a way that showed the word "green" was no a breach of the law.
The decision relates to the property of Aucklander Richard Green.
The commission found the hedge was similar to that of the logo of the Green Party.
It says the hedge carried no promoter statement, as was required under the law at the time, the Electoral Finance Act.
The commission found any potential breach would not have been wilful and it would not be in the public interest to pursue it further.
However, the Family Party has been referred to police. The commission found that two donations exceeding $20,000 from the same donor had not been declared in time.
The Electoral Finance Act was repealed on 17 February.