How well do graphite and charcoal work together?

Question? wondering whether you can use Both to do a landscape.

in one of my recent landscape drawings; I attempted to put draw a base of charcoal (specifically a charcoal stick) to show value and then draw on top of that.

Epic fail!

the charcoal blended terrible and didn’t seem to play well with graphite at all!

but I wasn’t sure if it was more that, graphite and charcoal don’t mix or is it that I’m just awful at using charcoal.

what do you guys think?

do they mix? do they use the same techniques with both?

any little wisdom you guys want to impart about the differences between drawing with charcoal and graphite would be appreciated.