Sand ofcourse
the black bean grows faster because the seed germanates faster
Yes. Try them in both.
no, they rot in sand
it is better in sand
Very little will grow in sand as there is no nutrients present. If you mean sandy soil then yes it is ideal for all annuals as they flower better with very little feeding.
It grows better with soil. Soil has more Nutrients. I've done some test on it Sand doesn't really grow at all with just play sand from what I've tested.
No, I don't think so.
Sand.
plants that like water grow better in clay and plant that don't like water grow better in sand. like cactus
They don't grow better in sand they need more attention than in soil. They don't grow better they will survive but need more attention than in soil.
There is nothing in sand that will make plants grow.