Sure... just be judicious in its use. Wood ash is excellent in raising pH of the soil, and neutralizes acid soils. So, it's best you know the pH levels in the soil so as not to add toomuch. If you have acid loving plants, especially rhododendrons and azaleas and many varities of evergreens you would avoid spreading the ash near them.
Best of luck!
Clanad and taichiperson thank you both for your advice it's very helpfull. I'm growing some fruit trees and some fruit bushes, so it should be good for that. I was thinking of adding it to water [but not too strong] and using it as a feed, say once a week. Thank you for your help.