Good mix for potting hostas?

People have recommended adding fine bark to potting mixes. But I have never seen bark in that form. I've tried cutting regular pine bark with a scissors, but that takes forever. I do not have a line trimmer to chop anything. They seem to break almost at once, so I've given up on buying one.
Hopefully this is a good formula. It was not cheap, so I only bought one bag til I find out. Thanks!

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