voyager

Hi Dmitry,
I have no advice to give you on your banana project.
But, you have my utmost admiration.
I assume that you're from St. Petersburg.
I lived in Alaska for over 30 years at 61°N, about the same latitude as you.
I grew orchids in my home for many years and dealt with the seasonal daylight changes, 19 hrs or sunlight in the summer and 19 hrs of dark in the winter.
I never had the guts to try growing banana plants under those conditions even though I thought about it often.
I hope it grows well for you and you get to eat some home grown bananas.