Avoid extreme temperature and humidity changes. When traveling from one climate to another always keep your instrument in its bag; this helps slow down any temperature changes of the bamboo. Bamboo can be sensitive to very cold weather / low humidity (don’t leave it in a car in winter).
Our flutes are tuned at room temperature. Colder weather will cause your instrument to play a bit flat, so if it’s a little colder blow some warm breath through your instrument to bring the pitch up into tune.
You can oil the inside & outside every few months using a high quality oil. Coconut oil, mineral oil and walnut oil work well. To oil the inside, tie a cloth around a dowel or rod and push it into your instrument gently.