Early spring, while the trees are still dormant, is the best time to transplant trees.  It is a bit too late to do it this year.

Wood ash from a fireplace tends to raise the pH in the soil, so try to avoid acid loving plants like hollies, other evergreens and ferns.

Here's a link with more information about using fireplace ashes in the garden: Fireplace Ashes for Lawn and Garden Use | Oklahoma State University (okstate.edu)

Thanks for contacting us,

Judy