The 1890s was a period of growth and stability for Hakalau. No longer a start-up company, the Hakalau Plantation hired George Ross as manager and later his brother, John M. Ross, as Head Overseer. Together they provided steady leadership and support for both the business and the community. A new mill was built as well as a stately home for the plantation manager, which still exists today. The plantation added new lands and the workforce continued to grow, with laborers almost exclusively from Japan. The perils associated with the weather and the location of the mill were evident with both storm damage to the mill and the loss of a ship, the Kihalani, on the rocks at Hakalau. The need for road development begged attention.
- The City Directory of 1890 describes the Hakalau Plantation Company:
HAKALAU PLANTATION CO, James Chalmers manager, W. G. Irwin & Co agents Honolulu, 2,800 acres, 200 acres under cultivation; estimated yield 1891, 6,500 tons; two mills, capacity 12 and 16 tons per diem respectively, 500 men employed; fluming system employed in handling all cane; 25 miles flume; post office Hakalau, 15 miles from Hilo
- The City Directory of 1892 describes the Hakalau Plantation Company:
Hakalau Plantation Co., District of Hilo. Geo. Ross, manager; W. G. Irwin & Co., agents; H. V. Patten, bookkeeper; R. Saddler and J. Angus, engineers; F. Kaapa and F. Coleman, sugar boilers; L. S. Thompson, physician; J. Unea, schoolteacher. Employs 773 men.
- The City Directory of 1894-95 describes the Hakalau Plantation Company:
HAKALAU' PLANTATION CO, George Ross mgr, 4000 acres under cultivation, capacity of mill 50 tons per day, employees 650 men, W G Irwin & Co agents Honolulu, Hakalau
- John M. Ross, brother of George Ross, hired as Head Overseer. In 1905, John M. Ross replaced his brother George as Hakalau Plantation Manager and served in this position until 1942.
- The City Directory of 1896 describes the Hakalau Plantation Company:
HAKALAU PLANTATION Co George Ross Manager, W G Irwin & Co Agents Honolulu 4000 Acres Under Cultivation, Yield for 1896 7000 Tons of Sugar, Capacity of Mill (24 hours) 50 Tons, 650 Men, 200 Head of Stock Employed, Hakalau
- Hakalau Plantation Manager's house built while George Ross was manager.