wood ashes are wonderful..besides using to prep a garden they are wonderful dusted under trees & bushes. they are also great to use in your compost, just add a layer in between the other materials as you add the layers,it also helps break down the materials faster.
If you use too many ashes in your gardens the soil could become too alkaline. Always pull a soil test first. Also ashes get tracked in the house and make a mess
Patience is worth a bushel of brains...from a chinese fortune cookie