Here are three of the five pots (10") of my Hibiscus Insularis, or the common name of Phillip Island Hibiscus, from the Phillip Island in the Norfolk Island Group. This species is listed as Critically Endangered under Australian Federal Environment Legislation, with just a few small groups of plants still remaining on the island. These plants grow to about 2.5m in captivity and as they grow, the small leaves get bigger and more leathery. I've protected them from the frosts, but they tend to lose leaves due to the cold Winters, but recover when the warmer Spring weather arrives.
These five plant have been recently potted up so I'm hoping they put on some new growth in the next month. I do have a plant in the ground in the end of a raised garden bed and it is slowly growing, which is good for here in Maffra.
Below are a couple of photos of the potted plants and a flower from the Internet.
Hibiscus info here
My connection with these plants occurred many years ago when I owned my Ozgrow Garden Forum and was contacted by an elderly man from Mornington on the Mornington Peninsula, who wanted to make sure I got cuttings from this plant he had growing in his backyard. I had a couple of tries at taking cuttings, but never managed to get any to strike. I did however manage to get a seed to germinate and get a seedling. One day I got a phone call from his son to say he had passed and had collected some seeds for me to collect . I found the easiest way to grow these was from cuttings of the young immature seedlings and I have grown several in this time.