All five hazelnuts are planted. The easternmost holes had much more sandy soil, due to being on the edge of the septic fill. The westernmost two holes had dark loamy soil with some earthworms and a little clay. We only encountered one large rock, but lots of medium and small rocks and some rotting wood and roots.
Now we have a grove! I love the phrase “hazelnut grove.” We are happy with our new tree planting. Sam says the yard now has a “feature.”