Rusty Hinge 2 writes
The message
from Charlie Pridham contains these words:

I remember them from my childhood, hadn't made the connection beause I
didn't know anything else then.

Mary



No, the ones on nasturtiums are cabbage whites caterpillars

Mottled green and black/brown?

All the cabbage white caterpillars I've seen have been - er -
caterpillar green in hue.

The green caterpillars are small white not cabbage white. Though see the
post above about the different species which are all referred to as
cabbage white
--
Kay