Zelda Tears of the Kingdom Blue Nightshade
The Zelda Tears of the Kingdom Blue Nightshade material is used for Increased Stealth, Cooking. You can use this ingredient to make Steamed Fruit and many other recipes.
Effect: 
Stealth Up
Stealth UpDescription: A plant that grows in quieter areas of Hyrule. At night, it gives off a soft glow. Cook with it to increase your stealth.
Where To Find and How To Get Blue Nightshade
The Blue Nightshade is most commonly found in the following locations: Great Hyrule Forest, West Necluda.