• Plant galls
  • Plant galls

Plant galls guide

The FSC Plant galls identification guide features colour illustrations for 69 common plant galls. The accompanying text gives further background information on gall identification and causers.

A plant gall is an abnormal growth of plant tissues. A plant produces this abnormal growth under the influence of another organism. Galls provide shelter and nutrients for the invading organism. Well known plant galls include oak apples, witch’s brooms and robin’s pincushions.

Gall causers include fungi and invertebrates, such as aphids, mites, gall-wasps and sawflies. Plant galls occur almost anywhere that plants grow. They occur on the stems, leaves, flowers, fruits, seeds and roots of plants. A good list of different plant galls can be made in a domestic garden, particularly where there are mature trees or wild flowers. Oaks and willows are particularly rich in galls.

The guide was produced in partnership with the British Plant Gall Society.