France - 23,000 4. Turkey - 120,000 9. Greece - 20,000 5. Ukraine - 47,057 10. All in California.
Principal countries are Japan, Germany, Spain, Italy and Israel.
All Juglans spp are monoecious, bearing male and female reproductive organs on separate flowers on the same tree. Although J. regia is self-fertile, it is heterodichogamous, either protandrous or protogynous depending on cultivar. Payne' has good bloom overlap, and can be planted in solid blocks. Each catkin may produce 2 million pollen grains. Pistillate flowers lack visible sepals and petals, and are small and green.