Hao in Hawaiian Culture: See above.
Collecting Seeds: The flowering and fruiting of hao is a variable event with different populations fruiting at different times of the year and even a single hao’s flowering being influenced by the rainfall that year. In cultivation, they can flower and fruit more than once each year. Hao fruits are about the size of a grape but are often bilobed containing two seeds. The seeds are mature when the fruit is dark purple or black and soft. Sometimes you can find viable seed in the soil below the tree. Test these by seeing if they float or sink in water; the viable seeds will sink. Unfortunately, nearby rats often crack open and eat the seeds so that all you will find are piles of seed-halves. Seeds remain viable in a refrigerator for at least five years.
Growing from Seed: If your fruits or seeds were collected from the ground be sure to clean and sterilize them prior to sowing. Using either Method One or Two, hao seeds begin germinating in about two months and can contiune sprouting for several months. The seedlings grow rapidly in the nursery and should be 10 inches tall in 3-6 months. They can be planted out at this height. In the nursery, the seedlings are normally pest free although I have had a few die quickly, I believe, from overwatering.
Growing from Cuttings: I’ve never tried to grow this plant from cuttings but I’ve been told it’s possible.
Growth in the Garden: Hao require a little more water than wiliwili, ‘a‘ali‘i, and naio to grow quickly and vigorously. However, like many other dry forest plants, you really don’t have to water hao after it reaches about two feet in height. After five years, maybe sooner with watering and fertilizer, your hao should be about ten feet tall and flowering. The plant does best in full sun and will look a bit spindly if planted in constant shade. Trees in the open tend to be bushy. However, with some pruning of the lower branches, it’s possible to shape your hao into an excellent shade tree.
Diseases & Pests: Hao have a white sap that seems to deter most insect pests. One exception is the Sphinx or Hawk Moth (I’m not certain which species; there are several in Hawai‘i). The female Hawk Moth lays its green eggs on the leaves of the hao. There, they hatch and the caterpillars rapidly consume the leaves. If you see this type of damage, you can easily remove the larvae by hand. Fortunately, the caterpillars do not eat the growing tips of the branches so a new set of leaves quickly grows back after the pests are gone. I have witness entire (small) hao rendered leafless by these caterpillars, but they have never killed a plant.
Unfortunately, while I have propagated and plant out hao in both garden and restoration sites for over 20 years, none of these plantings have lived past their 10th birthday. All these mature hao gradually (over months) lost more and more of their leaves and then died. I know these premature deaths were not natural since I have visited wild hao that are well over 20 years old. To date (2022), I have been unable to determine the cause for these deaths, but suspect some type of root disease or pest since I have not observed any cause above ground. Refer to my discussion on this topic in my introduction to ‘ohai.
Ā ā Ē ē Ī ī Ō ō Ū ū