I am in a similar situation. Luckily the corm of mine were wrapped in sphagnum and plastic wrap, so they were kept moist. I removed all the black / mushy leaves and they both appear pretty healthy under. I just planted them in a 50/50 houseplant potting soil / perlite mixture. I am in NYC and its about to get really dark and cold. Luckily it is in a small bedroom with its own temperature control, so I can crank up the heater in there pretty easily. I am also probably going to put a PAR38 and/or BR30 on a 16/8 hour timer to see if that helps stimulate growth. And maybe a humidifier. The North East is so challenging.
fingers crossed (and any advice welcome)
The larger one is a Musa Tanee, smaller is a Musa Aeae.
