This is where caution is the order of the day! Onions and garlic tolerate ash well as a fertiliser. However, you should make sure that the soil in the bed is really too acidic. The ash should also never be spread on its own. Always mix a little compost with it.
But now for something very important: If the ash that you have delivered to you comes from printed paper or cardboard, you can assume that it is contaminated with heavy metals. The same applies to ash from pellets or wood briquettes. In these cases the devil is in the glue that is used. So if you do use ash, use untreated wood if possible.
I just wanted to bring this "problem" to your attention in a timely manner.
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I tested my soil before adding wood ash and it was already acidic. So hopefully adding this ash will bring up the PH quite a bit.
As for the heavy metals in the wood ash, I was not aware of that. Thanks for bringing that to my attention. I will do some testing to find out if it contains high amounts.