The item ID for Birch tree type 1 is Birch1 or Birch1_aut
This is the spawn command to give yourself Birch tree type 1 in Valheim normally without the level option.
Copy the command below and paste it into your Valheim game or server admin console to obtain.
This is the spawn command to give yourself Birch tree type 1 in Valheim with the level option if applicable. Below is just an example with the item chosen. Some items do not have leveling.
Copy the command below and paste it into your Valheim game or server admin console to obtain.