Correction: This article has been edited to clarify a gain on the sale of $120m, not $285m as earlier reported. Apologies for the error.
PGG Wrightson has been cleared to sell its seeds business to Denmark's DLF Seeds.
The Commerce Commission said the $434 million transaction, announced in August, was unlikely to substantially reduce competition in any of the markets it assessed.
"DLF is not at present a close competitor of PGG Wrightson Seeds in respect of ryegrass seeds containing endophytes and is unlikely to be so in the future," deputy chair Sue Begg said.
"Further, the merged entity would continue to be constrained by Barenbrug Agriseeds, and a number of smaller competitors."