Can I grow my plants in just sand? Don't I need some kind of soil??

Most, if not all plants will grow in rocks, they may need liquid
fertilization, but not potting soil, or soil persay...

much has been done with pure soil, meaning, no other chemicals added, just
dirt... and many horror stories have been brought here with "Help, my fish
are dying, and I dont' know why" as the subject... they were all using the
wrong soil, or something similar...