silkworms will eat chow, mullberry leaves, dandelion leaves, grape vine leaves, soft or thin-shaved carrot, and more.
You can make a paste (blender) from dandelion, grape vine leaves, mulberry leaves, mustard greens, basil, some steamed sweet potatoe, some cooked carrot, a little wheat germ, a dash of spirulina and a little pinch of brewers yeast. I found mine didnt take to this paste right away, but smearing it very thin on fresh dandelion leaves (which they were already accustomed to) a couple times did the trick.
(use up quickly -dont make too much - or use extra for hornworms, crickets and roaches )