Fig. 25. Shade in Position.
L. B. Hetrick, Shade in Position. (Patented).
This image is from Shading and Blight in Harding's Ginseng and Other Medicinal Plants, 1936.
A herbal distance course
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.