Recently from my trip to Hawaii I brought back some Ti Leaf (Red Cordyline) cuttings. On the package it says to soak them in water until they develop roots around 5cm long. I have had them in water for about 1 month and I see no sign of roots or growth. The instructions told me to remove the wax coating on each end of the cuttings so I did that with a knife, I didn't damage the cutting itself.
I replace the water around every 2-4 days and the cuttings aren't rotting or anything like that. What should I do?