Letters to the Editor
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TELL THE GARDNER
that you will have him arrested for tresspassing if he comes back and does anything else to a property that the neighbor doesn't own and that the owner has not requested his services.
Wait until the son comes back home and ask him if you can replant those oelanders to another part of the yard, or return them to the person who so rudely put them there anyway - whichever he prefers.
Get with the son and the mother and tell them that you have people coming to (paint, mow lawns, fix whatever) and would like to split their time on the job between you and them. Tell them the services are already paid for, and it would be a shame to not take advantage of their being there and their willingness to do additional work for free.
It's a white lie, but it allows them to save face and maybe get somethings done that improve the over-all appearance of the property.