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  • From: Nathan Wilson <>
  • To: mailing list at ibiblio - Northamerican Allied Fruit Experimenters <>
  • Subject: Re: [nafex] Morus Nigra Chilling Requirements, Etc
  • Date: Mon, 28 Mar 2016 10:25:49 -0400

Thanks very much Fred. This is exactly the sort of information I'm looking


On Friday, March 25, 2016, Robert Bruns <> wrote:
> I have M. nigra "Noir de Spain" in a pot. I overwintered it in a cool
> greenhouse where the temperature was set to 60 degrees but got down as low
> as 35 on extremely cold nights. The plant sprouted about a month ago,
> which implies that your option D would work.
> A few years ago, my previous greenhouse had its heater fail on a night
> the temperature got down to minus 15. My Morus nigra survived, but my
> didn't. So your options A and B might work, but I think they are iffy.
> your option C, I'm sure the plant would leaf out in the basement.
> Good luck!
> Fred
> central Indiana, zone 6 (formerly zone 5b)
> On Fri, Mar 25, 2016 at 12:11 PM, Nathan Wilson <
>> wrote:
>> Hi everyone,
>> What are the chilling requirements of morus nigra?
>> 1. Minimum chilling hours needed to ensure fruit set the next year.
>> 2. Maximum temperature that 'counts' as chilling hours.
>> 3. What conditions trigger the plants to break dormancy?
>> 4. What are the lowest short-term and long-term temperatures the plant
>> survive?
>> Background information: As mentioned in a previous post, I'm in zone 5/6
>> and have morus nigra in 87 litre (23 U.S. gal) pots.
>> I'm weighing my options:
>> A. Bury the plants in winter, just like some people do with figs. I'm not
>> sure if morus nigra is hardy enough for this.
>> B. Put the plants in an unheated, detached garage over winter. I think it
>> would get far too cold in January and February and would kill the plants,
>> although I haven't documented temperatures yet.
>> C. Leave the plants outside until around Christmas to satisfy chilling
>> requirements, then put them in a cool basement, which is presently 12
deg C
>> (54 deg F), and hope the plants don't break dormancy before I can bring
>> them back outside.
>> D. Greenhouse: I have a mekeshift greenhouse setup in my cellar door
>> stairway. The temperature fluctuates, but I can control it to a point.
>> benefit of having the plants in the greenhouse is that I think it could
>> reduce the number of years it takes the plants to bear, by making them
>> slightly healthier and more vigorous (this was pointed out by Lee Reich).
>> But, perhaps I can't have my cake and eat it too.
>> Any input or experiences would be appreciated.
>> -Nathan
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