question on planting multi plants. first hand experience please

i need some expert advice please, Someone who has done what i want to do.
long story short i want to plants 3 plants in the same container, a full size recycling bin. Evenly spaced in a row each about 10 inches apart/ can i do this the bin is very deep and airated on the bottom. it is like 20-30 gallons i think. What will the roots do? thanks

roots will get tangled then if u have a male u will hurt the others getting it out

all my plants are female,, and the 3 clones going in the bin are female from my mother plant

ok well i guess u can then i just like to keep separate incase something happens but if u want to go for it