Bonnie, I agree with Tom.....just leave it alone, and let nature take it's course. I have a couple that are doing the same thing, this year, and, in fact, I have had several, over the last few seasons do it...in my sand, I try to always keep those "stugglers" watered (NOT a problem , lately !!), and *most* usually will finally catch on, and take off.
If I receive one that is especially dry, or small, I'll pot it, right away....but, as Tom suggested, taking one out of the ground, and potting it just seems to always be the straw that breaks the camel's back .