Dittany is habitat-specific: it favors poor often rocky and acidic soils in well-drained sites. Sparsely vegetated roadbanks along or near ridgetops are good places to look.
The little mint is well-known for producing the subject of this post: frost flowers. Ephemeral in the extreme, one's window to seek the fascinating phenomenon of frost flowers is quite brief. I've long known of frost flowers but had not managed to catch up to them until last Friday, November 18. I was at the lodge at Shawnee State Park in Scioto County for a meeting and stayed over that night. The day had been relatively warm and the ground was damp due to previous rains. That night the mercury nosedived, and when I went afield at dawn the following day it was 13 F. Perfect for finding frost flowers and that mission was foremost on my list.