The above picture demonstrates the effect of growth rate for Black Walnut on the end grain (growth rings) and the
planed surface for: S-slow growth, M-medium growth, F-fast growth.
Sorry about the picture. It’s a Forrest Service black and white photo. Please contact us if you know of a better photo.
What you are supposed to see from the photo is that as you progress from slow to fast growth the grain on the
planed surface widens towards the appearance of softwoods such as pine.
