Comment by seszett
Very nice, I could suggest two more factors influencing growth that are important for plants: geotropism and phototropism.
Geotropism basically makes plants grow away from the source of gravity, and phototropism makes them grow towards light (and that is usually reversed for roots).
To OP, I don't know why but you're apparently shadowbanned, and your comments appear "dead" even after vouching for them.
Probably an automated heuristic, you might want to send an email to mods so they can reverse it.