Try putting up warning notices around the boundary of your Garden.
I.E.
"No Pukekos Past This Point".
If that doesn't work then maybe you could request a family group conference and politely ask them to stay off the garden.
If by a remote chance that doesn't work , and I can't see any reason why it wouldn't work, then I'd blast them with a 12ga and make sure you have open chokes fitted if your only shooting 25m.
Cheers
Pete
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