musa basjoo

hi can anyone tell me what im doing wrong as
new leafs appear the tips turn brown and spread
down the sides as the leaf grows it is keeped in heated greenhouse at 13 deg many thanks

 

Other than a very dry atmosphere I cant think what it could be, red spider maybe a possible cause but not likely at this time of the year.
Is 13C a max or min temp?
Is it growing now and has it been growing through the winter?
A picture would help.

 

thanks for reply pete 13 deg is min temp its been there about 2 months been told they need lots of water & feed but not sure how much & when Also got a dicksonia antartica one with a good root ball that seems to be doing ok sorry can not get picture to upload will try again later