Usually people are talking about a Gardenia radicans (Creeping Gardenia) when they say dwarf. The creeping Gardenia gets somewhere between 2 feet tall and 2-3 feet wide. I think though you grow different species in Hawaii than we grow here in the south east. There are a LOT of Gardenias!
Your question led me to the very interesting web site for "The Plant List," which identifies 145 accepted species names for the genus Gardenia:
Thank you for a very interesting web site about plants...I'm researching on planting and trees...I have a very large property that needs alot of planting and landscaping... Don't have a clue on gardening and planting. Have to educate myself...Thankyou...Especially when I live in a tropical climate...
keep us posted on your progress :)
Yes, please do. We can all live vicariously through your adventure in Hawaiian gardening.