In seed-starting mix, 1/4 to 1/3 produces nice seedlings. In the
soil, I do not know. The N-P-K is not very high. I remember advice
for container plants of 1/2 worm castings.
I would think you would treat it like a weak manure. Where I
might use a cup of Tomato-tone worked into the soil around
a plant, I would probably use a couple of gallons of horse,
rabbit, llama, or alpaca manure. I would put the worm castings
in the same class with the manures. Like rabbit, llama, and
alpaca manures, worm castings need no composting first,
but one should mix it up with the soil to get some air spaces
into it (so it does not become a solid clod like cow manure
when it dries).
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