How far apart should I plant these to form a nice hedge?
This plant grows to 5-6 feet wide when fully grown. Therefore, to obtain dense hedge growth, they should be spaced 5 feet apart for a tall hedge or closer together to form a low hedge.
Here in SC the 100 years' flood put our ligustrum hedge underwater for approximately 2 weeks. They now stand with curled, brown leaves. Is there any chance they will come back in the spring?
Unfortunately you will need to wait and see.
The duration of the flooding causes the roots to suffocate.
Here are some links with more information.
My ligustrum lucidum hedge is about 2 years old and has suddenly had leaves turning yellow with brown crusty spots on them. How do I kill this desease and what is it?
This sounds very much like cerospora fungus. It can be due to damp weather or excess moisture levels. If your hedge is not receiving good sunlight also can cause issues.
Prune out the diseased material and dispose of, rake the ground and clean up the litter.
Treat the plant with a fungicide like myclobutanil or Immunox.
How do I get rid of litgustrum? It is extremely invasive. I cut it to the ground and it came back triple fold.....
You will need to dig up and remove the root ball.
I fertilized my ligustrium with fertilome a month or so ago. Since that time, the leave have start turning brown from the inside of the canopy, and some outside canopy. It may have been over fertilized. How can I save the large scrubs. I thought maybe to rake all soil from around tree root and perimeter?
Review the fertilizer schedule in the link below and compare with the applications you made to your shrub.
You can try flushing the area and pruning out the damaged plant material.
I have two ligustrum that have developed small brown cluster that produce very small leave bunches. There is one trunk that has completely transformed to this issue and looks barren , but is not dead. it has been going on for 2 years. It has spread to the other trunks of the tree and to the2nd tree in back yard. Neighbors tree has no sign of infection. I have read try Neem oil for fungus and insecticide. any other ideas? help?
This seems to be a fungal infection. Very strange though, as it seems to force it to flower and die at the site. There are a few ways to help cure the area of the issue, but I recommend using wettable sulfur, along with some dolomitic lime to buffer the soil. This should help clear up the issue.
Can a sunshine ligustrum be transplanted?
Yes, these tend to be very vigorous, and will do just fine with transplant. I wouldn't wait much longer though. Once it gets hot, there is a much greater chance of death of a plant.
This article will help you in transplanting shrubs and trees: https://www.gardeningknowhow.com/ornamental/trees/tgen/transplanting-trees.htm