was winnie the pooh she or he?

The first line from Winnie Ille Pu:

Ecce Eduardus Ursus scalis nunc tump-tump-tump occipite gradus pulsante post Christophorum Robinum descendens.

Sounds masculine to me.

who firstly sung "yellow lemon tree"

Best I can find is a song called Lemon Tree but which refers to a "yellow lemon tree"; it's credited to Fool's Garden.

http://www.lyrics.pl/teksty/zagraniczne/foolsgarden/lemontree.htm