*bump*

My parents had a Sissoo tree that was hideously large. They had it professionally reshaped/pruned, but a year later, was even bigger and scarier than before. It, too, was sending out roots that were sprouting all over the yard. They had it removed (most of the trunk, too), then continued to apply Round-up to the sprouting tree babies that were coming up around the yard. It took about 12-18 months of diligently spraying the babies (chopping them out made it worse), but it's now officially dead and gone.

What a disaster that was. I cringe every time I see one of those trees planted in commercial applications near a home. They're terribly invasive, IMO.

I live in a clearing in the woods. I leave most hackberry trees to grow naturally but need to have a final end to the rowdy ones that grow on the 12 ft slope below my "pier and beamed" pool blocking the view into my glorious native woods and shading any plantings I want to do on the slope and around that end of the pool. Every year either I or the lawn crew cut them down but by mid summer they have regenerated 10 ft tall and up masses of saplings.
QUESTION: Would drilling holes in as many "trunks" as possible and then pouring Roundup into the holes accomplish anything? If so how often should I retreat? Should I dilute the roundup?
Sure would appreciate some suggestions here. They are driving me crazy. BTW.. My dogs (Mastiffs) like to take a daily chew on the leaves so I leave a couple of well trimmed ones near the house for them to munch on. I made the mistake once of cutting down their favorite one and it seemed to cause them great distress until it came back up (very quickly). I have no idea what they gain from this habit but my dogs are very healthy and live much longer than the average of their breed.