In the last week or so I got a coal from White Ash on White Ash bowdrill and several handrill coals with Horseweed on Basswood. The Horseweed is great, the best I have experience with the possible exeption of Yucca and Mule-fat but has the added bonus of growing around here.
My co-instructor Chris and I harvested a dozen or so Horseweed plants from along a railway this week as well. They are drying now.
Andy