The flowers are a nuisance but the only thing I know to do is prune them off before they open. I don't know if they will attempt to produce more flowers this year, but this is what I would try. At least nearly all the flowers are on the ends of the shoots. Al

Privet is one of the most common hedge plants. I think it would be hard to escape the pollen even if you do cut the flowers off yours. That said, I can't remember ever seeing flowers on a formally pruned privet hedge.

Both my wife and i have had bad allergies last year from this type of tree. We had 2 of them and they covered the yard with yellow pollen last july and august. We cut one out but the other one in the backyard is 25 ft. high and
I'm not physically able to cut it back. It has 5 large
trunks branching out. Does anyone know if Roundup would
keep this tree from blooming.

Gene, I don't think Round-up would keep the tree from flowering if it's that big. There are chemicals to keep things from fruiting, but I have never heard of anything that will keep something from flowering. Can you girdle the tree to kill it?

Renee

Trees can and do get out of hand,even the Ligustrum which is not usually thought of as a tree. I grew 7 of them across the rear of my old property to screen out the adjoining high school. I started the limbs above the six foot fence and they grew very well. Soon they were so high I put a ladder on the bed of a truck to get high enough to prune the top to keep them from getting any taller. When I sold the property I had several trees that had become a problem and a potential high cost for professional removal. The new property owner confessed she bought the property because of all the "lovely" trees. Al

Ligustrum lucidum is most definitely a tree if it isn't hedged. This may not be the Privet/Ligustrum species you have, but it is very commonly used in coastal California as a reliably evergreen, larger leafed Privet species. It is also a seriously invasive weed tree in irrigated gardens, from bird spread seed. If it gives you allergies,(and the scent of the flowers is too strong for my tastes), your best option is to remove and replace with something else.