I was trying to think of the name of that popular berry hybrid that is grown in Aussie (originally when I posted). Thanks for the post, I got to remember that youngberry is a good heat tolerant rubus sp. cross. I know for a fact boysenberry can handle 100 degree heat of Orange County, CA , without slowing it down. However I am unsure of its ability to tolerant hot and humid at the same time. I would hope its resistance to humid fungal issues is decent.