Chop Large Stumps with a Copper Axe or better
Chop Large Logs with a Steel Axe or better
Break Mahogany Trees for hardwood
Clear the Secret Woods daily for hardwood
Recycle Hardwood from the Woodskip Fish Pond quest rewards if available
Buy hardwood from the Traveling Cart when sold
Get hardwood from the Farm Cave if bats are not chosen, only indirectly through other sources is not applicable
Use the Lumberjack profession to increase hardwood drops from trees and stumps
Use the Secret Woods and Farm Cave area daily for consistent hardwood farming