I've got two 4' x 4' raised beds from last year that have Mel's Mix from SFG in them, and have three new raised beds this year that I just did a mix of mostly compost and some topsoil. One is 3' x 6' and the other two are 4' by 12'.
I didn't do anything to remove the grass underneath the beds before I built and filled them, just got rid of any obvious weeds like dandelions.
So, here's my question -- will earthworms somehow eventually find their way into my raised beds? Or should I add some? I've been tossing any earthworms I find when weeding or working in the rest of the yard into the raised beds, but esp. in the ones with the Mel's Mix (1/3 vermiculite) is this not a good thing because it will harm them somehow? I'd love to have earthworms building and improving the soil in my beds but I don't know if they can/will find their own way in or whether I would need to add them proactively.