Fireplace ashes should be saved to use a fertilizer for your Iris and other alkaline soil plants.
If the fireplace ashes in your compost are made primarily from hardwoods, like oak and maple, the nutrients and minerals that will be in your wood ash will be much higher.
Fish waste or manure (high in nitrogen), a shovelful on each layer
Woodstove or fireplace ashes (high in potash and carbon), a shovelful on each layer
Crushed rock dust (rich in minerals/feeds microbes), a shovelful on each layer ...
 See also: Soil, Compost, Grow, Fertilize, Plant
  
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