I think, I have these shrubs around iron and wooden fence to give privacy. I would like to grow them taller (next to wooden fence where I do not need a hedge at the bottom). Some of them grows faster and thicker. Some of them are not growing at all (next to wooden fence). Would like to get suggestion how to grow them taller quickly.
Next to wooden fence:
In the corner between wooden fence and iron fence:
Ones growing faster and thicker :