05/24/2026
“Hey Tim… what’s all that black speckling on that aspen log?”
“Well Brother Tom… that’s what can happen UNDER the bark when aspen sits too long with moisture trapped against the log.” 😅
This aspen log was cut less than two weeks ago, and even in the cool spring weather, mold had already started forming underneath the bark before we got it onto the mill.
Aspen can be especially prone to molding and staining because it holds moisture so readily. Once the bark loosens or traps humidity against the log, mold can begin developing quickly — and if left unchecked into the warmer summer months, that staining can pe*****te into the boards themselves.
That’s why getting logs milled promptly, then properly stickered and stacked for airflow, is so important.
Early on at Driftless Hardwoods, this was a hard lesson learned. We had several beautiful aspen logs mold so severely that the lumber simply wasn’t saleable.
What makes aspen especially challenging is that it often requires MORE care and urgency than some of our higher-value species like walnut or white oak. The handling, milling, stickering, stacking, and labor are virtually the same whether we’re cutting premium walnut or low-cost aspen… but the financial return certainly isn’t. 😅
Still, when processed correctly, aspen can be an incredibly useful and affordable hardwood for projects and school woodworking programs.
Now we know:
✔️ Mill it quickly
✔️ Sticker it immediately
✔️ Let that moisture flash off
✔️ Keep airflow moving
Every species teaches you something… and aspen taught us this one the hard way.
Built by nature. Crafted by hand.