I'm thinking unrealistic. Plant height depends on many factors. So does parenting. I am a 65 year old
avid SW Ontario outdoor gardener. I love mainlining my plants and grow bushy plants. 10 or more stalks 4' tall. I have gardened most of my life so it's natural for me. Growing outdoors can be as easy as sticking a plant in the garden and watering it along with the flowers. Or you could have 10 rain barrels for water. Compost piles, make your own natural fertilizers from garden wast and grow 100% in real living super soil. I have learned to do this over a few years growing since it became legal. It depends on how far North you are. You may want to grow Auto flowers rather than a late flowering variety. Crack the seed Last week of April and get them in the ground May 1 then watch them for frost like I do. This year I'm starting a White Widow Auto, A Pink Kush Auto a Laughing Buddha Not auto. The Autos will harvest early to mid August. Something like Buba Kush will harvest late September when it's still dry. Buddha will harvest early to mid October. It's raining season hear so Buddha can be a challenge. I have to cover this plant with a portable rain shelter greenhouse thing to keep the buds from getting rained on and dry so I don't end up with soaking wet moldy buds. For me it's worth the effort. For me I'm watering my gardens anyway why not grow a few nice plants as well.
If your into such an adventure check this out.
I have also grown a few years in potting soil and good old hardware store Pro-mix fertilizers from the hardware store and grew great plants as well. It's not hard. The hardest part is getting out of the plants way and letting it be.
Check out the link.
https://www.thcfarmer.com/threads/growing-organic-buy-nate-growing-like-a-viking.14768