Police have hit back at social media trolls who called the seizure of more than 900 cannabis plants a waste of time.

About 30 police officers took part in a Tasman operation to prevent the supply of drugs at the start of March, and posted information of the seizure on the Nelson, Marlborough West Coast Police Facebook page.

Commentators were quick to criticise the operation, with the majority of the comments questioning the purpose of targeting cannabis.

Read story.