The silkworm feeds on what

The various species raised today are distinguished by the quality of the silk they produce. Silkworms feed on the leaves of the mulberries (genus Morus) and sometimes on the Osage orange (Maclura pomifera). Bombyx Mori will not bite, making it an ideal worm for feeding most reptiles, amphibians and other animals.

Silkworms only eat mulberry leaves and/or artificial silkworm diet (Silkworm Chow). If you are going to feed the newly hatched silkworms mulberry leaves instead of Silkworm Chow be sure and only feed them the new growth (tiny 1/2 to 1 inch leaves) or they will not be able to eat them because their jaws are too weak.