Hi mcrooke37,
Glad to hear someone else is growing from seed, and experimenting. I can't really give you a good anwser on this one, but I did over winter one in my non-heated green house and it did fine. I think it will be hardy to zone 7(more likely in a drier winter climate, than where i am). I'm pretty sure that Musa nagensium, and Musa Cheesemanii are one and the same(seeds, and plants look exactly the same), but M.nagesium might be the more hardy of the two. There is a German company selling three different types of M.nagensium, so there might be alot of differences in this plant.
Did you grow your M.yunnanasis from seed? Is the mid rib red?
I have a few different hardy types grown from seed if you'd be interested in a trade. M.sikkimensis, M.'Bhutan', M.balbisiana, LMK
Kyle

I also grew Musa Nagensium from seed last summer. I have 3 or 4 that made it through the winter in the greenhouse. I also grew Musa Cheesemanii and didn't feel like they looked or grew the same for me. I guess we'll all find out more next year! Good luck with yours.

This is the place for info! Please post picks this year of the differences between the two. I'll actually be more happy if your right, but the seeds and plants seem really similar to me. {{gwi:405952}}
The seeds are identical, but it's hard to see. I'll post some 1 gallon nagesium with 2 gallon cheesmanii as soon as I get them developed from regular film. They are super fast growers!

I have both sprouting now(nagensium and cheesemani) The nagensium is growing faster so far. My yunnanasis did have a red midrib but it faded when it got larger. They made it through the winter. Each corm has three sprouts coming up. My basjoo and sikkimensis are both sprouting up fast. I have an ele ele banana that I overwintered indoors and planted it outside. The summer like temps we have been having did not agree at all with it. I dug it up and put it back in a large pot and placed it in the shade to see if it will come back. I read to place it in full sun but it seems not to tolerate it very well. I am going to replant in in semishade and try it there. My yunnanasis trunks were a nice blue color. I did not grow them from seed. Bought them off of ebay. They were about 5 or 6 inches tall when I got them. The largest one grew to 8ft last year. I am also trying to grow some velutina and abyssinian bananas. I am going to mulch the velutinas but I am going tom dig up and store the abyssinians in my storage shed. I don't think they would make it through the winter here if mulched.

Out of 30 seeds only 2 of my nagensiums have sprouted. 18 cheesemani, and 24 velutinas. I will be using the tiller alot soon.
Tropicallvr I don't have much right now to trade but I will have plenty to choose from by next year. I am just getting started. By that I mean bananas, palms, Many differant types of cannas, elephant ears,(giant xanthosomas) and maybe a few yucca rostatas. I also have several types of bamboo. How big did your banana plants get the first year from seed?

The M.nagesium, and M.cheesemanii seem to be some of the fastest Musa from seed, but M.balbisiana seems equally fast. These may turn out to be really big plants.
Here's Cheesemanii in upper right, and nagesium in lower right(germinated at different times).
{{gwi:405954}}