I've had a woodburner for more than 20 years and many many chickens for at
least that long. I have a magnificent compost heap on which chicken
manure and woodash go, 3/4 chicken/1/4 woodash. It's viewed covetously by
my neighbours.
You can dig woodash into your garden, I know someone who grew some good
parsnips in almost pure woodash when he dug so much into his soil.

I spread a little around my roses and any plants I think would benefit
from potash but otherwise it goes on the compost heap.

You should not have that much ash, a wood burner needs to burn on a bed of
ash - I only empty a bit of mine out once a week.

Tina

Thanks Tina, I was a bit concerned about putting ashes on the compost in
case it stopped the worms doing there work on there, after all the worms
are a big part of a compos heap.

Wally