Sawdust from Maple trees

I’m not sure if this should be posted in this forum or not but if it’s not in the right place maybe someone can point me to the right place to post it?

My neighbor gave me some sawdust from some maple trees and I had him dump it where I plan on planting some flowers this year should I mix leaves with it or will it be ok to just leave there over the rest of the winter then plant some irises and ligularia.