Babs' has #2 and I think 1 and 3 are just variations on a leptospermum or tea tree. And #4 is an Erysimum or perennial wallflower.

Leptospermum for 1. But not convinced for 3.

ETA try Coleonema pulchellum for no. 3

Second the Coleonema for 3.

1. 1. Leptospermum is a genus of shrubs and small trees in the myrtle family Myrtaceae commonly known as tea tree

   2. Pelargonium is a genus of flowering plants which includes about 200 species of perennials, succulents, and shrubs, commonly known as geraniums

   3. Coleonema pulchellum commonly known as confetti bush, buchu, diosma or breath of heaven, is a shrub which is endemic to South Africa

   4. I couldn't find anything for this

Maybe you didn't spell it right

#4 is clearly Erysimum as noted above.