Green caterpillar identification please!

[debj10]

Hi, hoping someone can identify these caterpillars for me. My daughter wants to watch one grow and see what kind of butterfly/moth it changes into.

Found loads of them munching away at my basil, though they seem to like tomato leaves and runner beans as well! Pretty small at the moment, about 15-20mm long, lime green in colour with tiny black spots on the back and a thin yellow stripe running down each side. Some of them were found among the Thai basil, and were slightly more purpley/grey in colour, but have changed back to green on the green leaves.

Thanks for your help

[charlieb]

It's a Bright-line Brown-eye Lacanobia oleracea.

They pupate underground so it'll need an inch or so of loose soil - they also overwinter so when it has pupated stick it outside in a shed or somewhere cool and check on it regularly from April-ish onwards (the adults fly from May onwards) or bring it back inside where you can keep an eye on it.

[debj10]

Thanks, just googled some pictures and they look exactly like these.
Hope my daughter is feeling patient!