Even those Cabbage White Butterflies are not as common as they used to be. I remember clouds of them flying around in the Summertime when I was a child. Long time ago.
Of course the caterpillars still manage to get into my cabbage crops. Always finding them on my broccoli leaves.
I usually grow parsley just so there will be a host plant. And I have different types of Milkweeds and Butterfly Weed growing in my garden. For nectar I have lots of plants including the fall blooming goldenrods.