Some plants have them regardless but others will form if not enough nutrients are found in the substrate.... its really clever if you think about it.
I cant remember the exact name given to them, but i figured by calling them "roots" you would know what i meant lol
Ok but I have less than a month old mgops fluorite. liquid ferts flourish and API iron and potash. Co2 high light. And I dose ferts a lot cause I'm always thinking more is better
And my cabomba does this my h sunset green myrio and a reineckii. All shoot out those root runners