Narrow/Shallow amount of Soil available - OK for Rose of Sharons?

I live in a home that has a two car garage butting up to my neighbors 2 car garage. Our driveways meet.
There is a 5 inch wide space between our driveways that runs the entire length of the driveways. It is filled with soil about 6 inches deep. In this narrow space there are a few - what I think are Rose of Sharons - that are planted in this narrow space. They appear firmly rooted.
I want to plant the entire length of the drive in the rest of the narrow space to provide a screen between both driveways but I dont know if this is the right plant for that small of space. I know Rose of Sharons grow tall and like a vase, so I think the root ball must be small.....but 5 inches wide by 6 inches deep....is this enough to get a ROS root ball into and fill? I still cant figure out how the other ROS's are planted there.
Any other ideas for a type of tall fast growing plant (doesn't need to be an evergreen, but that could be better) that will get good morning sun but filtered and mostly shaded in the afternnoon and has a very small root ball?
I'm really curious about the planting root ball requirements for the ROS's though, this puzzles me.
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I don't think that much that grows tall can grow in that little space! They must have really strong roots under the covering of the driveway! Wow! Okay, back to a suggestion, grasses - there are several ornamental grasses that grow tall and are beautiful all year.
just an idea.
dancing in my mind, gloria in hemlock hollow where all the wondrous flowers will disappear tonight. - down to 25F
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Whatever you put there is going to need WATER. How are they going to get enough? The more plants you add, the more competition for whatever water manages to get through. You're going to reach critical mass very quickly and everything is going to die.
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