Lori, I send you a big hug. The bad thing with dementia is it also changes the character of people. And you now deal with a person who is no longer the person you love.
My mom passed away last year and this makes me very sad. But I also know that the person she was when she died was no longer the wonderful person she had been before.
I am sure that he feels so much better deep inside by being able to stay at home and having that garden. Wishing you lots of strength.