Garden Mystery

Here's another set I used at last weekend's stamp camp. I loved the simplicity of the image and sentiment, but I'm not sure what this flower is.

At first I thought it was an amaryllis, so I went with a coral scheme...

Then I thought maybe it was a rhododendron so I switched to purple/magenta...

I have one more to color -- what is this flower and what color should it be??

Have a terrific weekend and get out to enjoy YOUR garden!