Hi Diane, I live in Canada on the west coast, Vancouver Island. We are in Zone 7b - 8a., so we do not see the temps. you do. Are summers can be 80 -90 F. My Adeniums live indoors from
October - April.
You are fortunate to live in a climate where you can grow them all year round outside.
Sandy & Cheryl from Australia on the Adenium group that I have belonged to for quite a few years now have marvelous plants and so many others there growing beautiful plants.
They have produced some real beauties and with importing plants into Australia being negletable, growing from seed or getting from people such as Sandy is the easiest.
Looking forward to seeing your plants as they grow.
Rick