If you are new to taking photos of wildflowers or dissatisfied with you wildflower photos you might want to take at look at this article on Wildflower Photography Wildflowers Photography tips and tricks – nature magazine.
It has a lot of good practical suggestions. A few more I would add are
If your camera has live view use it to help get a sharper focus.
If your camera has a depth of field preview button use it to see what parts of the flower are in focus and to see if your background is distracting or complementing your subject.
If you get really serious about flower photography I would recommend getting a Macro lens.
Natural History Wanderings 
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