Transport via Plants does inanimate plant have to be alive?

@JeremyECrawford for the spell Transport via Plants does inanimate plant have to be alive for spell to work could it be a stump/petrified?

— Mathew Michalak (@Trogaf) January 17, 2017

@Trogaf @ChrisPerkinsDnD i'd say it needs to be alive #wotcstaff

— (((Mike Mearls))) (@mikemearls) January 17, 2017

@TrogafThanks for the clarification. Would Giant (underdark) mushrooms be excluded from ability of spell, since they aren’t plants? yeah if you're being picky, but I'd probably allow it #wotcstaff

— (((Mike Mearls))) (@mikemearls) January 17, 2017