Egy kis infó ginkgo-ügyben, innen: http://www.xs4all.nl/~kwanten/propagation.htm

" In Chinese literature it is said that seeds marked with two ribs produce female trees and those with three ribs male (although these are more rare). Also the seeds should be sown in such a way that they face each other and those with three ribs should be grown along a waterside..."

"Ginkgo can also be propagated by cuttings (best way to be sure of the sex). Take young or half-ripe wood about 15 cm long during May-July. Put these in a frame  and keep moist. They usually start growing best in their second year. You may also take cuttings of mature wood of the current year's growth. Shoots about 15-30 cm long are taken in December and placed in a frame. They should root in the spring."

"For instance the old Ginkgo in Utrecht is male and the leaves of the female branch turn yellow later in the season than those of the male tree where the branch is grafted upon ... Also the female tree tends to have almost horizontal branches."

Egyébként nyári dugványozásból tényleg minden faxni nélkül megered, tapasztaltam, tél alá még nem próbáltam.