What's your soil pH right now?
I believe 5.9 pre any amendments.
& Im seeding every bed with loads of worm poop.
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That's pretty low. I would probably not wash my biochar of the ash as the ash will raise pH. Might even consider adding straight ash for a time.
I love this chart as it shows max nutrient uptake by plants given pH.
Worm castings is supposedly 6.5-7 though 🤔