I tried to repot today. I had to have all 10, but at the end I counted only 9… I am very sure I lost it somehow while washing and separating from each other, but I can’t find it… Ok, nine plants, Morus Nigra seedlings, with very long roots, replanted from 8oz cup (I think) into separate 20oz cups:
Now, some water from the bottom; I don’t want to compress soil until plants have some rest & establish
Keep up the good work!!! My nigra seedlings have all failed around the 4th or 5th year, and I don’t know why…
I’ve read somewhere, if growing in a restrictive pot, at some point fruit trees will stop growing and start fruiting 
something like if you plant Antonovka apple tree in a pot, then it may stop growth and start fruiting; but if you plant in the field, it may take 20-30 years until it becomes “full-size” and starts fruiting. Let’s try 
BTW I have Mulberry in a pot, 2-seasons-old seedling which I bought from nursery, which lost leaves with first frosts in October; it is in my basement, and it started flowering!!! Less than 1m in height seedling!
I have a nigra (Black Beauty I believe) that I have had in a pot for 10 years or so now.
It comes inside each winter and overwinters in a cold-canning room, dormant. it fruits ok, but the tree is only about 5 feet tall total.
Scott
Hi Scott,
I was considering a similar plan but not sure if the benefits would be adequate. What quantity of berries do you get in a typical harvest from your Black Beauty? And how big a pot do you have it in?
Duane
I have two of Black Beauty, grafted on Morus Alba Tatarica, I bought it in Spring 2018 from https://www.whiffletreefarmandnursery.ca/ nursery in Ontario, and they grow outside in an almost purely sandy area; front-yard, and back-yard.
I am in Zone 6b (as per Canada’s government site); Toronto, Ontario, Canada. Winter temps can drop to below -35C for a few days; it happens each Winter.
“Black Beauty” at front-yard is in an open place, no fences, only rare cars and bungalows - absolute full sun area.
They woke up each Spring very late; one had few fruits which probably were stolen by squirrels. Last year I was even so worry that long branches with unopened branches will dry out entire trees that I trimmed it (in May); and I was right, it started good growth few weeks later.
The only issue I had: fungal infections, and so bad that trunk on both cracked at bottom, black inside, I used Copper fungicide few times and it stopped it; and I almost washed it in this fungicide before first frosts. And, BTW, farmers in Percia use copper fungicide too, their trees have the same diseases from time to time.
Both trees grew slow this year because of fungi; next year I’ll trim too many branches at bottom, to allow fresh airflow. Few branches started opening buds this Spring, then dried; although we have more than enough rain.
“Black Beauty” in Winter; it definitely needs clearance at the ground: trim all tiny branches to allow more airflow. Maybe even more drastic: leave single main “leader” branch only.
Look at this, fungal damage:
I think it’s remarkable that you have M. nigra that grows unprotected in Toronto. I would not think it’s possible but your photos prove it is.
Where did you wind up getting your seeds from? I might wind up trying to grow one of the long Berry versions from seeds if I can find some.
But I didn’t try it yet; I don’t have enough space for all
Morus Nigra seedlings, update.
They all look different!
Any updates?
