They have to be stored in a cool (dark) place from what I have read. With a good temperature being about 65-degrees. So I plan on keeping them in my office which I tend to keep on the cooler side in the winter months because I like my environment cooler rather than warmer.
But I'll keep an eye on it and let you know

I never heard of Ylang Ylang before but I do like the scent. Very pleasing and not too harsh