This birch stump has been breaking down for the past few years. The resulting material feels light , moist and smells earthy. We have been composting kitchen scraps for years and this feels like something that would be beneficial to add to the mix. Any thoughts?

Definitely.

Absolutely.

Check out this article: http://garden.org/ideas/view/d...

For sure. Don't waste that good stuff.

I agree ... perfect all natural material for compost!

You can, but don't see the point in adding it to the compost heap since it's already broken down. Just sprinkle it on top of a bed if there's enough.

If its decayed enough to break up in your hands, its ready to go as mulch.

If its too chunky, give it another at-bat in compost bin.