Crocosmia 'Emberglow' ?

Good Day, Plant Lovers --
I was so excited over all the talk about Crocosmia Lucifer that I bought a
half dozen c. 'emberglow' last week.  Now that I have most of them planted, I
read the "fine print" on the tag which says USDA zone 7 (0 degrees) to zone
11.  I paid very little for them so won't be out much if they don't survive.  
However, I will be terribly disappointed!!!  They are starting to bloom and
are beautiful!  

So what can I do to increase their chances of survival?
Dig a larger, deeper hole and put gravel in the bottom?
Have the soil tested?

Thank you for your help,
Best Wishes, Barbara
USDA Zone 5, Rock Island, IL
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