Good question i been wondering

say my plant is gonna be max ( 5 ft ) , means i need 5 gallon pot, now my question is

can i use a container, and put blockades of ceramic making walls, and have 4 squares, and each has 5 gallon of soil in heightness , and its like 8 inchs wide ?

you mean a tall container? sure, it would work.

ya . not based on wideness , just more on the tallness , you seem to have understood what i ment so thank you !

I wouldn't add the baricade, there's no advantage to it and would make the water penetration more uneven.

well the container is gonna be holding 4 plants, and ive put the barricades so roots wont spread on each other and attack each other, and i would water them seperately, with holes in the bottom for drainage

think thats ok ?

You will run into problems of light penetration with them only 8" apart at 5' tall. The fan leaves will block off light quick. You will end up with like 4 quater round christmast trees as the inner facing branches will never take off. I had 2 plants outdoors 12" apart. The branches facing each other were very weak come harvest time compared to the rest of the plant.