Q.Tall container trees for sunny area along my fence
I live in southern California, beach city Zone 10-11. I have a sunny, but narrow, area (approx 3-4 ft in depth x 22 ft long) along my fence line on the side of my driveway. It is also an unintentioned focal point from our backyard patio. I
Certified GKH Gardening Expert
The plants in this article can also be grown in pots:
From that list arborvitae is likely your best bet in terms of height and privacy.
Since you are in zone 10/11, I would recommend looking at brugmansias as well. They will stay green year round where you are and have truly breath taking flowers and scents. Plus, they do well in pots.
I will also let you know for the size you want these trees to get to, you will need rather large pots. You will likely need to buy them from a specialty shop.