Cat Repellents

Cats dont like water, so if you can keep the environment damp they wont hang out there. They also dont like spray bottles, if you can spray them a couple of times that will usually work as well and they wont be back. The other thing that deters them is cayenne pepper. You can sprinkle it around where they like to lay and they wont.
Usually the spca will loan out catraps, you can always catch them and take them in. That's what I do here often-- (Im an apt manager and we get tons of ferels and cats that tenants leave behind when they move), we trap them and take them to the shelter. They multiply fast and next thing you know EVERYthing smells of cat pee.

You need to trap the female in heat and take her in and have her spayed. The SPCA usually works with organizations that provide for spaying/neutering of stray cats. Once the female is spayed, your problem will go away. Good luck...

buy some coyote pee (for real) and spread it around the peremiter of your yard. for real, you can purchase it online.

Try a hose. Every time they start calling in your yard spray them.
Or set a sprinkler up that you can turn on when they are near.

You could call the animal control and have the M. trapped. Then there is no reason for the boys to hang in your yard.

I, for one, would most likely catch the M. get her the shots she needs and spay her. THen keep her indoors. Oh I already did that, hence my 3 cats.

Get a dog!! Or invite a neighbors dog to pee all over your yard several times a week. My parents started having cat problems after their dog died. They trapped the female and had her spayed and released her. End of night time drama and feral kittens. But they paid for the procedure. Good luck

I've tried the cat repellent spray in a can, for an ex-roommate's cat, to keep him off of the kitchen counters. It works for the exact area that you spray, but cats have a pretty good jumping range, and, they'll just jump over that spot. They're also pretty smart, and will just go around wherever you spray. I doubt you'll be able to cover EVERYTHING.

I've heard of sprinklers with motion sensors on them. You might have luck with that.

We had a cat using our flowerbed as a litterbox. My dad suggested making a spray out of red pepper, and spraying down the dirt. I happened to have some powdered pepper spice that we ended up not caring for, and just sprinkled the flower bed with it. It took a couple of days for the cat to realize we were being consistent, but it eventually worked. You might treat your flowerbeds the same way, if that is also a problem.