It is always difficult to take photos in the middle of the day under bright sunlight and those are exactly the conditions when I took this photo. The problem is, if I wait until later in the day when the sun isn’t overhead, the flowers are closing up. And overcast day would be better but we rarely have any overcast days during the summer months.
Maralee
Through My Lens 
you may be able to subdue the light with a semi transparent umbrella?