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It is possible that there are air pockets in the soil that are affecting the roots. I would step firmly on the root balls to help collapse any air pockets. Flood the area with water to help fill them in. Up its watering as well. It may also have a fungus disease, so I would treat the plant with a fungicide.

Pretty hard to say what it is with no description or picture. I will say that when people see a "white fungus," 9 times our of 10, they're seeing mealy bugs, scale, or aphids. And a heavy infestation will cause all the leaves on many plants to drop. So I'm going to give you an article on these pests, so you can see if that might be what you have, and what to do about them:
https://www.gardeningknowhow.com/plant-problems/pests/insects/whitefly-control.htm

Here is an article on tree repair that will help you:

https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm

What type of hedge is it - I can better assist you if I know what it is. Was this a recent planting? What kind of light does it receive (full sun, part shade, etc.) How often have you been watering it? Is there drainage in your cement pots? Please get back to me with the answers to these questions and I will be happy to help!

You may want to check with your local city ordinances regarding this matter.
Neighborhood Associations also generally have guidelines for home owners.

https://www.gardeningknowhow.com/special/spaces/creative-screening-with-plants-good-borders-make-good-neighbors.htm

I do not see an image attached to your question.

This could be a nutrition deficiency.
Here is a link that explains this.

https://www.gardeningknowhow.com/plant-problems/environmental/leaves-turning-reddish-purple.htm