 Crops include macadamia nuts, papaya, mango, coffee, and other tropical fruits.Irrigation canals known as the Upper Hamakua Ditch and Lower Hamakua Ditch (not to be confused with the project of a similar name on Maui by Henry Perrine Baldwin) had been built in 1910, and were repaired in 2001.While virtually all of the pre-existing native forest below altitudes of several thousand feet was removed by sugarcane cultivation, several remnants of native forest can be found.