Scat Cat

If you have cats digging around in your garden and using your flowerbeds and pots as a litter box then no worries.  There are several things you can do!  Start by removing all the droppings-cats go where their noses tell them cats have gone before.  Follow up with a commercial cat repellent, to cover any smells left behind.  Don't expect the repellent to perform like Hercules;  you really do have to start by cleaning up.

One the odor problem is solved, make it hard for cats to dig by covering any open soil with landscape cloth or a very loose mulch such as pebbles or bark nuggets.  This leaves newly planted soil as the only vulnerable area.  Cover it with chicken wire until the new plants have achieved fair size and can be further protected with mulch, and you should have the little dears thoroughly thwarted.