On the i phone 6plus (ios8) is there a way to delete all mail in the mailbox at once?

[iMore Question]

I followed your steps on how to "trash" individual mail. Thank you.
I get more than 400 pieces of mail per day from work. And I need to delete them all at once. Is there a way to do that?
On my blackberry I can, can't figure out if that is a feature on the iphone or ipad ios8.

Thanks So much
Ruth
Ruth@DoulaCare.com