In zone 7B you don't have to worry.
In on 8B where I live, we still don't worry
In Hawaii, well, THEY WORRY

Thanks Bihai, your reply was short and sweet, made me chuckle.

I think the only one I have heard about being somewhat invasive is the varigated kind, and that of course is in Florida, where they get nearly perfect conditions.

As Bihai says, so much depends on climate. When I was in Miami (Zone 10) my neighbor had a shell ginger that he refused to tend. By the time I moved away, it had a 30' circumfrence and knocked down a portion of the fence. Whover has to eventually deal with removing that thing will have to get heavy machinery.

Here in San Diego it is still zone 10 but temps on average are cooler. Here, when I find a shell ginger that is even being kept alive outdoors, it is a special day. And the occasional one I do find is slight in size (compared to Miami) and usually somewhat scraggly and beat up looking.

I tried Zingiber zerumbet here. It came up fine with foliage for 2 summers. The second summer it tried to flower, but the flowers never fully developed before winter. Then it didn't come up again the next season.

Regards,

Rick Clark

I have been growing Zingiber mioga for 2 years now. I would say that in my area, this species is weedy, or even mildly invasive.

The plant is now sending up shoots up to 2' away from the original planting site. There are some shoot that are popping up in the lawn. This is after I dug up lots of pieces for a garden exchange this spring.

Happy growing,

Dan

Z. mioga is from China and extremely hardy. Except, of course, for the single container that I had, which promptly died, in the summer, for no apparent reason. Sigh....

Bihai:

Let me know if you would like more Zingiber mioga. I have plenty to spare.....

Dan

here on the alabama gulf coast, i planted 4 plants from a friend last spring. right now i have 16.

Due to their ability to create many above ground bulbs each year, I found these species to be pretty aggressive spreaders in north Florida. I doubt they'd be a problem in zone 7!

Globba globulifera-Purple Globe Ginger
Globba bulbifera-Yellow Dancing Ladies

PF

Well I have decided that I would just as soon have Cannas as they bloom almost year around here.That is the super dwarf ones, I can't have anything that I have to divide every year.Getting to old for that.I have gotten rid of the plants that take over.Jessie