How long can plants be left alone if I am traveling? Ryan Woltz June 28, 2017 16:43 Updated Follow Most plants can be left alone for around two weeks. Related articles Do I need to use the mobile app? Should I remove pods that didn't sprout? How long do seed pods last? What are the ingredients in the plant food? What could be causing my plants not to germinate? Comments 0 comments Please sign in to leave a comment.