Onion Seeds Valheim 1.0.20
Onion Seeds is a material found in the Mountains biome in Valheim. It is used to build Onion.
“Plant to grow a healthy onion.”
Onion Seeds are a Material. The in-game description says to plant them to grow a healthy onion, and the Onion is the one thing they are used to build.
Each seed weighs 0.1, and you can carry up to 100 in a single stack. They can be teleported, so they are not held back by portal restrictions.
Used to build
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.