Cabbage whites like rose leaves

[Jimmy]

Why do cabbage whites like settling on my rose leaves?
I don't think they lay any eggs, just sit there for a while.
Possibly eyeing up my kale plants near by.
Jimmy

[Vegi potager]

And why are there more cabbage whites than just about anything else flying around?
Picked a dozen teeny tiny caterpillars of the broccoli tonight, decided they could have the collards