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Tree identity - Oak? But not acorns..

Hello forum friends..

A friend & I have a query..out on a country walk we came across what looks like an Oak tree sapling..However the nut/seed doesn't look like a normal acorn so wondered if anyone could shed light on what this is??


  • DovefromaboveDovefromabove Posts: 83,990
    edited September 2018
    That’s a gall caused by a gall wasp laying an egg in the tree. The gall forms around it and the larva grows inside. The hole is where it emerged. They’re colloquially known as ‘oak apples’  :)

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • wild edgeswild edges Posts: 9,376
    It's a wasp gall. Basically a wasp lays eggs into the leaf bud and the larvae corrupts the growth to make a gall to protect itself while it grows. There's quite a few different types that effect oak trees but these are called oak marble galls or oak apples. They used to be collected to make into ink.

    I have one on a shelf over my desk and it hatched one day.

    Tradition is just peer pressure from dead people
  • Thanks so much - mystery solved! In awe of how much knowledge you all have on here.. :)
  • PalustrisPalustris Posts: 4,114
    Called Oak apples because when they first erupt they are bright red.
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