Ginkgo biloba ‘Kórnik’ was found as witch’s broom and propagated for the first time in 1985 by J. Surma and is named after an Arboretum in Poland. The Kórnik Arboretum in Kórnik, Western Poland, which is the largest and oldest arboretum in Poland, where it was purportedly discovered growing on a 200-year-old tree. The Kórnik Arboretum and fourth largest arboretum in Europe, with over 3300 taxa of trees and shrubs and is the home of the Institute of Dendrology of the Polish Academy of Sciences. This is a male cultivar which can be quite variable in shape. It was once described as being a more extreme version of Ginkgo biloba ‘Saratoga’. It is also often confused with the Czech cultivar Ginkgo biloba 'Chotek'.  
 
Description -  Ginkgo biloba ‘Kórinek’ on this cultivar there are leaves typical for the species, fan-shaped, with a characteristic indentation at the top forming two flaps, 5cm - 8cm, as well as very reduced, jagged, threadlike leaves. It is a slow growing cultivar, 10cm - 20cm is typical. It has a spherical in form, after 10 years expect a height and spread of 0.7m. In the autumn it turns a rich golden yellow.