hi. i am under the impression that if i were to cover the base of my plants(about 8 inches tall) possibly put some root horomone on it, roots would form under the soil on the stem. i start mine in 16 oz cups and i may only fill the cups 1/3 of the way and cover the base as the plat grows, to ensure the entire cup is full of roots before i transplant them. I am trying to keep the plants fairly short and bushy, and big roots are crucial. would there be a benefit to doing this over just planting them in a full cup? anyone out there with advise, please, your .02 would be appreciated. thank you very much

Cannabis has a tap root that penetrates deep, so it's pointless to use that method. just fill the cup up and it'll be full of roots in no time.

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???... the roots don't need any prompting to do their thing..if you want a short multi cola'd plant think about LST.. see charts in my sig link...
Covering soil can risk mold..better for air to get there..... Luck.