Rhododenrum - 1/100sec, f22, ISO 3200, 450mm equiv,
One of the tricky problems with taking pictures of flowers is whether to use a dedicated "macro" lens such as the Nikon 105mmf2.8 macro.
I think this is a very good lens. But, if using a wide apperture - say f2.8 -5.6 - it may be difficult to achieve a desired depth of field.
There are techniques for overcoming this - namely taking of several pictures with a different focus distance and then focus stacking the set of images in Photoshop or other software.
Multiple images tends to force you into the use of a tripod. This may not be great as there is the setup time to get a good composition. Some cameras can take multiple pictures by varying the focus distance from the closest object to the furthermost that you require for a flower. There are other devices such as Arsenal that might control the camera to do this. My initial experience with Arsenal is that it wants to do multiple images way out to infinity.