The only thing that comes to mind is that perhaps the plants are not getting enough sun. For good bloom that plant needs a lot of sun exposure. You indicated the area was sunny so if you feel this is not the cause then I suggest you give the plants another year and perhaps next spring/summer's bloom production will be better. The plants don't need much water and fertilizer is generally not needed either although if the plants are not looking very healthy, perhaps a light application (1/2 cup per 50 square feet) would be in order.
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