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A Banana is a fruit produced each day by a Banana Tree during its harvest season. A banana tree on the farm in Stardew Valley produces fruit during Summer. On Ginger Island or in the Greenhouse, it produces fruit year-round.
A Blue DiscusFish Pond has a 5-15% chance of producing a banana daily once the population of the pond reaches 4.
Banana is used in the spool of the Sewing Machine with Cloth in the feed to create a dyeable Relaxed Fit Pants. It is a yellow dye when used in the spool of the Sewing Machine with a dyeable clothing item in the feed. It can be placed in the yellow dye pot at Emily's and Haley's house, 2 Willow Lane, for use in dyeing.
Banana is used to activate the Banana Shrine on Ginger Island, to the left of the staircase leading to Leo's house. When a banana is placed on the shrine the torches light and a gorilla appears and gives the player 3 Golden Walnuts.
All on Ginger Island
Summer in Stardew Valley
Tiller Profession: 
Artisan Profession: 
Banana (1)
Sugar (1)
125
56
Mining (+1)
Luck (+1)
Defense (+1)
5m 1s
Island Trader for 
Bone Fragment (30)
260g
Iridium Bar (10)
Dragon Tooth (10)
Relaxed Fit Pants. It is a yellow dye when used in the spool of the Sewing Machine with a dyeable clothing item in the feed. It can be placed in the yellow dye pot at Emily's and Haley's house, 2 Willow Lane, for use in dyeing.