Red, I am sympathetic for your losses, and just wondering if, in the future, there is any way to avoid this. You can certainly talk to your son and point out to him where the flower beds are, but your husband, with his failing memory, may need some extra reminders. Would it be possible to put little flags where you expect the perennials to pop up, early in the season? Or little cages made out of wire?
We eventually have to give up a lot of things to accommodate our spouses' diminished capacity, but I hope having flowers and edibles growing around us isn't one of the casualties.