Ginkgo biloba ‘Trompenburg’ is a witch's broom found in a full-grown ginkgo in the Arboretum Trompenburg near Rotterdam.
 
Description - Ginkgo biloba 'HB Trompenburg' forms a compact and dense crown, usually with an irregular outline. Its height depends primarily on the place of grafting - specimens grafted low usually do not exceed 1 m in height, a higher trunk causes the whole plant to be correspondingly higher.