I’m having a difficult time hardening my American arinca plants. It\\\’s hot here in Oklahoma. Would it be advisable to wait
un til early fall to plant outside and would the fall give the roots enough time to establish?
Certified GKH Gardening Expert
This article will help you in caring for these: https://www.gardeningknowhow.com/edible/herbs/arnica/how-to-grow-arnica-herbs.htm