TB: Pests: Discouraging Cats

I have a problem with a neighborhood cat using two beds (one new bed with 
first year iris plants and one recently dug bed which will be planted in spring) 
for a litter box.

Does anyone have an idea for discouraging cats from using this spot? I was 
thinking of pouring something with ammonia around the beds in a ring, but I 
don't want to do this if it isn't safe, though.

Any ideas appreciated.

Mike in SCarolina
Zone 7b

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