I do not grow Sikkimensis, but I suspect that it has the same problem in warmer areas as other mountain banana species. They do not like temperatures above 90F, and stop growing or experience greatly slowed growth at such temperatures.
Musa itinerans, Musa yunnanensis, and Musa thompsonii all display this habit where I grow them. The highest growth rate in these conditions is Musa itinerans itinerans. In the spring, late summer, fall, and winter is when these cultivars grow best in my South Florida location.
Musa yunannensis
Musa itinerans itinerans
The best overall appearance and best producer award in my experience is SH 3640.
