There are some extremely cold hardy varieties but not sure this one is it. You can't always trust labels. One recently planted one sailed through the Winter of 2011-13 but got decimated by the last winter. Still, this plant, buried under 6-7 feet of snow and ice and multiple arctic vortexes, still has several green branches, and will probably survive. If I see the again this year, I will buy more than one! But the leaves in mine look a bit different, but according to the label (is listed as a frosthardy 'jasminoides').

I have heard there are a few varieties of gardenia that are hardy to zone 6. One of them is called Frost Proof.

Since gardenias can die very quickly and easily indoors, you might actually be better off trying to push your zone limits a bit and find a warmer micro-climate in your yard where it can overwinter. For example, you could try planting it close to your house's foundation in the warmest part of the yard with lots of mulch, or maybe overwinter it in your garage.

If you do try to overwinter it inside, my experience has been that the ideal for them is a combination of: cool temps, high humidity, and lots of light.

This post was edited by summersunshine on Fri, May 2, 14 at 20:04