What is dim about teaching your child to be considerate of others?
Nothing!
So throw the balls back, or tell the children they don't have to mope around all day waiting for you to get tired of making them wait, and invite them to climb in or climb through (via a flap) and get them instead. You can point out any plants you want them to steer clear of.
This would be the considerate thing to do. It would also model good sense to them.
Or you can sit on your high horse, indulge your feelings of being put-upon, and waste your energy being angry and dreaming up alternatives to football for these children who clearly love football.
Littleprincesssara, FYI - this is projection: Math, if someone has a newborn baby and is breastfeeding would you say they are being unreasonable for not wanting to put the baby down every half an hour to go running around after neighbour kids?
Your comment has nothing whatsoever to do with any details the OP has mentioned. If it doesn't have any relation to your own current situation why would you even bring it up? Flinging in hypotheticals of that sort seems to me to be the choice of someone with a massive bee in her bonnet about other people's children, an out of control feeling of resentment, and a desire to vent.
Others are clearly having the same problem, conflating their own experiences of feral children and teens with children whose only crime is to knock to ask for their balls back.
I would like to know how we get from the concept of a garden where children may quickly retrieve a ball to 'public playground'. Hysterical much?