I have rich black soil and it holds moisture and drains slow and compost will crust some to retain moisture but if you have big sticks and see no sand you may not have what you paid for. But iI'm not a soil expert just giving my 2 cent.I hate to change the subject but I moved here a year ago and my property is clay. It's awful. So we built some raised boxes to grow stuff. Then I ordered 3 yards of "garden mix" dirt which is supposed to be 60% soil (not clay), 20% sand, and 20% compost.
I go out today and the box I planted had a thick layer of crust on top. I water and the water takes forever to drain. And if I plant seeds they will never be able to push thru this crust. They also said it would be screened and OMG! there's a lot of sticks and stuff in it. I can't see any sand or compost. But the worst is I will not be able to plant seeds in there and expect them to break thru the crust. I just want to cry. Does this sound like garden mix?