I have a small Ohia plant in my home garden, but it hasn't been looking too healthy recently. I'm not sure why this is, and I took some cuttings to try and start a new healthier plant to hedge my bets. There's no point in my posting a picture of the now dead cuttings, but please keep your fingers crossed that one day my little Ohia will grow to be like the ones in Haleakala.
Also on Maui, we stopped at the Maui Nui botanical gardens in Kahului. I would recommend them to any visitor to the island. They have tons of native plants, including many alula and ihi, which of course made me ridiculously excited. They also had striped banana trees and some lovely varieties of sugar cane.