Chicks, I am a property manager and I BEG my tenants to tell me when stuff like this starts happening. these are not great people you are dealing with. I'd almost bet you money that they are not great tenants, either. I know tenants like this and he may be looking for an excuse to get rid of them. (I would be)
I don't know what the laws are in your neck of the woods, but in my state, coming over in someone's yard without permission is trespassing.
As an example, my mom has a neighbor she hates (she's actually related to her, too, but that's another story.) So the FedEx truck brings my mom a package while no one's home and the neighbor comes over and signs for it. Mom finds out when she gets home. Mom called the sheriff and told them she didn't want that woman in her yard. The sheriff told her they were trespassing and she could file charges if she wanted and offered to come over and talk to the neighbor right then.
I'm not saying you need to file charges against them for anything. (You probably could, but you don't seem inclined to. But isn't panhandling illegal in some places?) But if you told your landlord, and they are crappy tenants anyway, them trespassing and disturbing the neighbors and making a nuisance of themselves might be just the ticket he needs to get rid of them. He ought to know. I mean, it's this type of folks that are always late on the rent and they always trash the house while they are living there. I have to evict people for this kind of garbage at least two or three times a year. I'm always happy to be rid of them.
Cassandra