White House officials met with environmental advocates before approving potentially invasive crops for a renewable fuel program.

A week before issuing its final decision, representatives from six organizations met with officials from the White House’s regulatory, economic and technology offices to make their case, according to a review of meeting records. An Environmental Protection Agency (EPA) official also attended the meeting.

The green advocates warned the officials against encouraging cultivation of the two species, which are not native to the U.S. and can easily spread.

Read Porter, a senior attorney with the Environmental Law Institute who attended the meeting, has studied the effects of invasive species.