There is a good sized stand of about 40 small trees
at the RBG Arboretum if you go late May early June
you can't miss the large simple leaves and blood red
flowers.
Take the trail east of the interpretative centre. They
are on your left at the trail intersection at the bottom of the
slope.
Leave only footprints, take only photos.
If you are looking for you own I would suggest Grimo nut
www.grimonut.com
Since they not self fertilizing you will want to get two
Burlington Bill