New bed--is the soil sterile?
We are installing a new raised bed which we will use for our vegetable garden, and we got 4.5 cubic feet of top soil delivered by a reputable landscape company. Soil seems to be a bit more clay than I'd prefer, but probably still pretty good. We also bought several bags of mushroom compost and mixed it in. At the bottom of the bed is a layer of uncomposted organic material (leaves, dead weeds, trimming) and cardboard. We put those layers directly on the soil there, without removing the weeds or the weed seeds. (Sort of a variant of lasagna gardening.)
Here's my question: there is likely not a single living thing in the new soil. Should we be adding something else? Buy some worms? Add a LOT of compost? None of our homegrown compost is ready yet, which was Plan A.
I appreciate in advance any help. I've only amended beds, never started anew like this.