water
A good cat repellent spray would be the Mega Sonic Cat Repellent. It is entirely harmless to cats yet will still keep them away, and if you wish to, you can also spread garlic around your garden to keep them away.
Any strong chemicals can harm a cat, just as they can harm humans; and cats won't wear rubber gloves when there are dangerous chemicals around. Ammonia can easily damage the cat's sense of smell.
please some answer on how to keep cats from my plants
at worst case yes. never ever use dog flea repellent on cats
Because they can be fatal if ingested, mothballs are not a safe choice to deter cats. Two safer alternatives are vinegar and ammonia.
There are three types of cat repellents, electronic, liquid spray, and water. Garden Harvest Supply offers all three types of cat repellents.
ammonia
Ammonia is a chemical that can be found in a cat's urine. If you are asking if a kitten can get Pneumonia, then yes. Kitten's can contract pneumonia.
I've read that Cat nip and Bay leaves are an effective repellent. Also, Boric acid is supposed to kill all roaches because they take the boric acid back to their nests...
A lot of it is common baking soda.
It isn't. Cat urine is not fluorescent, and it does not glow in the dark. I'm not sure where this myth comes from. Cat urine is yellow, like human urine. To the naked eye, it is indistinguishable from human urine, except for the smell. Cat urine is ammonia-based (unlike human urine) so it smells of ammonia.