Flowering Acorns

Asked August 8, 2015, 9:44 AM EDT

I have found an Oak Tree on the estate here in the UK which has acorns that appear to be in flower. Small ridges of light purple all over the cone. Really pretty. Is this normal? In all my years I have never seen the like...

Outside United States

2 Responses

Looks like you gave Knopper galls on your acorns. A tiny wasp causes a chemically induced growth distortion of the acorn to house her eggs. These galls are found throughout Great Britain, and were initially thought to be a cause for concern. However it is now believed that they won't hurt the oak tree. Nothing needs to be done to control it. https://en.wikipedia.org/wiki/Andricus_quercuscalicis

Spot on!

This is a big old oak and around 90% of all the acorns are hosts to eggs. No other oak in the area has any sign of Knopper Galls.

Thanks for the knowledge.