

There is a magnificent specimen of black mulberry filled with lustrous green foliage in Central Park. I had my brother help me photograph one of the branches. To me it was a miracle because it isn’t suppose to survive in a New York winter. The black mulberry is the premier mulberry in terms of it’s cultivation as a fruit plant. It’s called a cultigen by people who are aware of it’s origins and distribution. Cultigen means it is of obscure origin which may not have a wild counterpart to it anymore. People have eaten the black mulberry for millenniums. I had previously grown this species at my farm from grafted named varietal plants. These were the huge white and black berries so well known in commerce in Pakistan and India called ‘Hunza” named after a culture noted for long life and great health. Most international food stores have these selections dried like raisins in clear cellophane packages. After a mild winter, the trees were destroyed well below the graft union. I next went to the grafted hybrids. They lasted a little longer when one fruited in my largest polyhouse next to some overgrown red mulberries. Many of the nurseries that produce this tree are in Florida and California. Taking a plant grown in the south and then plunked down in the north was too extreme. Next up for me were the seed sources. Hungary, India, Pakistan, Turkey, Southern Europe-Mediterranean regions are the main sources. Mulberry seed is plentiful, but quality is lacking. I think it might be overdried and old. I noticed on a social media post that someone was using the dried mulberry paste at the food store to generate seedlings. Evidently the seeds were still viable. My first batch of seedlings showed promise despite the great amount of winter damage on the twigs. I remember finding one tree out of two hundred after the first winter that survived minus 20 F with zero damage. If you look up the hardiness of the Morus nigra tree you will see a question mark near the Zone 7 indicator. This means, “I am not sure but 7 seems right” zone. The mega tree in Central Park was a pointed reminder of the questionable nature of giving plants zones in the first place. One tree points the way for a human to follow. One of those humans is me.


ON THE HARDINESS ISSUE OF TREES
It is both the seed source and a physiological response to low temperatures that allows most trees to tolerate cold temperatures beyond their indigenous and current cultivated ranges. You can take any warm loving plant and move it farther north. The best way to do that is from seed and then have several plants. I have Louisiana cypress on my hills in Michigan. I have Nuttall oaks from southern Georgia. Neither has experienced winter damage. To make that happen you grow batches of seedlings and wait to see what happens. Eucalyptus, palms, tea plants and even oranges can be grown far north. There is flexibility within the species to some degree. Either from a hybrid standpoint or an isolated population found in a northern location that is self-breeding, you can find plants able to grow in locations outside of its normal domain. The limits can’t be reached unless you have a population of “like-minded” plants all of which can interbreed and create an unwavering seed source able to withstand the speeding train of winter. This applies to apples in the subarctic region and to oranges in southern Michigan. You need a population not a cultivar.

This is something that is missing in the world of fruit selection where the cultivar is king and everything else is a worthless seedling. Here, it is reverse. It is the opposite of Luther Burbank breeding. Seedlings produce the best fruit for the climate which can then be recreated using more seedlings. Cultivars are a stopping off point like a train at a station where you go to meet a friend. You give it a hug. Have some coffee. Talk about old times. Remember when I sprayed you. Remember the mulch. You laugh. You cry. Then you say goodbye. That is the cultivar. Now, wave goodbye. I know. It’s emotional. You get attached to the cultivar. It was nice knowing you, cultivar. Thank you for your progeny. Now all of your progeny is cultivar and constantly improving while you quietly enjoy your farming life. There is less drama. Certainly you can create more cultivars. That is not bad but today requires a river flowing over and not a trickling brook. The trickling brooks are the patents and the misguided scientists who have exploited plants like they were wind up toys. The plants can do it better than a human. They are in on the ground floor of breeding. You are not. You are the facilitator not the owner of the plant. It’s a relationship between human and plant. That is what you are co-building.

From seed:
Mulberry has a tough seed coat and this coupled with a cold dormancy makes the seed require a year in the soil and cold prior to sprouting. There is also the opposite where no dormancy is required. This seems to be the case with Morus nigra. You would normally just surface sow the seeds like the birds do. When you buy mulberry seeds from the different seed companies here in the United States, it is hard to know how they have been handled when they were colleted and processed. We would just sprinkle them on a flat of soil media and cover them with a bit of sand or screened peat. Mulberry seeds sprout quickly and will continue for up to two years as some seeds have an internal and physical dormancy.
Everyone wants the pure mulberry. I think they are all pure. Under the banner of complex heterozygosity the mulberry does not care about your love of pure. It has other plans. It’s an out breeder. It can be dioecious, monoecious or both. More than the apple it hides its origins to the point even modern day genetics has thrown its hands up. I like that. It’s a plant with a plan. I’m a follower. One fruit and you too will follow.
Enjoy. Kenneth Asmus

































































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