Hummingbird and Butterfly Gardening: Who is this cat?, 1 by JaxFlaGardener

JaxFlaGardener wrote:
This is probably a common caterpillar, but not one with which I am familiar.

It is Granny Apple Green with a faint yellow stripe down its side that ends in the black "thorn" at its tail.

Any help with I.D. and whether it is friend or foe, and what it likes to eat will be greatly appreciated. I accidentally knocked it out of an area with ferns, Virginia Creeper, and Alstromerias today while cleaning out a spot to put in a new trellis. It seems very inactive -- I think it is already at the state of wanting to form a chrysalis.

Thanks,

Jeremy