Hi Elpollodiabollo,
I can't tell if those Cape Daisies are "lazy" because of some nutrient deficiency. That is a possibility. I suppose you could stake them, but that isn't ideal. There are green stakes that are almost invisible. Have you considered some thing that is pushing your Cape Daisies over, like a pet or wind coming around the corner of the house? Here in Kansas, wind is always a factor, and I grow my breeder zinnias in zinnia "cages" for that reason.
The zinnia cages work on the same principle as tomato cages, only they are sized for zinnias. I make them out of re-mesh wire. The zinnia cages don't look as good as green stakes would, but they are a little easier to use. I reuse my zinnia cages from year to year.
ZM