Unless the garden is fenced or you have a leash on him, I believe that you are fooling yourself if you think that supervising him is effective. If he decides to run off, you will not be able to catch him. If another animal comes into the garden, even just another cat or a dog, that may be when he decides to run off in fear.
Cats are not like dogs; they are not likely to be trained to consistently follow commands. Yelling "stay" to him isn't going to work. Without a fence or a leash you have absolutely no control over the environment or what he does. Even if you have him in your arms, he could very easily wiggle or claw his way out.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...