Phasmid breeders tend to think that Phyllium species are hard to breed. Often a high mortality during the first instar(s) is lamented, as hatchlings or older nymphs do not start or continue feeding even though good-enough food plants are available to them. And even if the nymphs feed and grow up well, then the males mature (and die) long before the females do - and the culture goes parthenogenetic.
These can indeed be frustrating situations... luckily there are solutions. The good news is that basically it's not difficult to breed Phyllium - with the right setup and when some details are observed. In the following chapters you will find helpful infomations to breed Phyllium successfully: