photographing magnolias and other white flowers

[praline3001]

How does one go about getting a good shot of an all white flower such as a large magnolia? If I adjust the WB I get either a bluish or orangish magnolia and if I change the exposure I get greyish ... if I leave it like is it looks overexposed. I am have a really tough time with magnolias
I am in the deep south and we have some beautiful magnolias but my photos just are not coming out right! I know I can go macro and get the green centers but that's not the look I am trying to go for... I am trying to get the petals in as well.
Here is an example of one of my photos that didn't turn out so hot:

I tried edits and when I try and change something I lose the white color BUT the white looks really overexposed
Thanks for any suggestions!

[batch]

I wonder if you were to cast a shadow over the entire flower so you don't get any shadow, then adjust your exposure until you get the look that you are looking for.

[lputman]

I don't feel that Magnolias are pure white, they are more off-white. Have you attempted with the camera choosing the WB and seeing how that looks?