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Author Topic: Dividing Jeffersonia dubia  (Read 13720 times)

KK-Ann Arbor

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Re: Dividing Jeffersonia dubia
« Reply #15 on: April 14, 2012, 04:41:06 PM »
Arrowhead Alpines is our beloved specialty nursery in Michigan with extensive offerings.  It was very sad to lose Bob this past December.   

I also had a chance to see Brigitta's J. dubia in flowers and just could not get over it.  I have been lusting for one ever since and I finally was able to buy one from a Japanese vendor this February when I was in Japan.  It was very tough to wash soil from its massive roots for inspection.  Reading this thread talking about J. dubia not liking its roots to be bothered is making me very nervous.

Koko 
in Ann Arbor, Michigan, USA - USDA Zone 5a

pontus

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Re: Dividing Jeffersonia dubia
« Reply #16 on: April 14, 2012, 06:48:23 PM »
i was just told by an expert grower in canada that jeffersonia dubia hates being devided, and should not be devided unless its a matter of lief and death....if devided, it will most likely die, or not do well at all.

Your plant is stunning, i would advise to leave it as it is and enjoy its amazing display for many more years.

after searching since 2007, i have finally found 1 or 2 sources for jeffersonia dubia that sell fairly good quality plants, although these take 1 yeasr to establish...so if you want more jeffersonia dubia, they can be found in specialist nurseries...so i would advise not to devide yours.

Pontus

TheOnionMan

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Re: Dividing Jeffersonia dubia
« Reply #17 on: April 14, 2012, 07:08:18 PM »
i was just told by an expert grower in canada that jeffersonia dubia hates being devided, and should not be devided unless its a matter of lief and death....if devided, it will most likely die, or not do well at all.


As I mentioned above, I divided a couple large clumps in late summer, and they established just fine without difficulty or setback.  Also, they're very easy from seed; small plants can flower the third year from seed.

1.   Seed flats of J. dubia.
2.   Seed flats of J. diphyllum
3.   Sown-in-place J. dubia, seedlings entering their 2nd year.
4.   Self-sown J. dubia seedling, which I believe to be a 2nd year seedling.
« Last Edit: April 14, 2012, 07:11:41 PM by TheOnionMan »
Mark McDonough
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David Nicholson

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Re: Dividing Jeffersonia dubia
« Reply #18 on: April 14, 2012, 07:12:49 PM »
The RHS Plant Finder lists 16 UK suppliers for Jeffersonia dubia and 18 for J. diphylla.

I bought a dubia at last years South West AGS Show and planted it out in a heavily shaded peaty bed, it was in flower and continued to flower well. This year it has sulked in the flowering department but the leaf looks OK. This year I bought another and this time planted it out in ordinery, gritty garden soil in half shade. Next year will tell!
David Nicholson
in Devon, UK  Zone 9b
"Victims of satire who are overly defensive, who cry "foul" or just winge to high heaven, might take pause and consider what exactly it is that leaves them so sensitive, when they were happy with satire when they were on the side dishing it out"

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Re: Dividing Jeffersonia dubia
« Reply #19 on: April 14, 2012, 07:23:23 PM »
Rick,
 
Its not that decent a clump yet so don't even think about dividing it! Why are you considering this drastic action ... selling? disease? I don't think so. Maybe let it grow?

I grow a lot of  J. diphylla and dubia, and they resent being messed with.

Enjoy it as it is, unless you have a reason to mess with it!
« Last Edit: April 15, 2012, 02:22:18 PM by ronm »

David Nicholson

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Re: Dividing Jeffersonia dubia
« Reply #20 on: April 14, 2012, 07:28:59 PM »
You feeling "liverish" tonight Ron? ;D
David Nicholson
in Devon, UK  Zone 9b
"Victims of satire who are overly defensive, who cry "foul" or just winge to high heaven, might take pause and consider what exactly it is that leaves them so sensitive, when they were happy with satire when they were on the side dishing it out"

ronm

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Re: Dividing Jeffersonia dubia
« Reply #21 on: April 14, 2012, 07:33:40 PM »
Possibly... but a little thick too? ??? ??? ??? ???

Explain ??? ??? Oh OK :-[.  I didn't mean to be "liverish". Apologies/ :( :(
« Last Edit: April 15, 2012, 08:57:50 PM by ronm »

mark smyth

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Re: Dividing Jeffersonia dubia
« Reply #22 on: April 14, 2012, 09:12:42 PM »
My Jeffersonia seeds never germinate - in pots nor self sown
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Jonny_SE

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Re: Dividing Jeffersonia dubia
« Reply #23 on: April 14, 2012, 09:24:50 PM »
5 years old seedling....
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Tony Willis

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Re: Dividing Jeffersonia dubia
« Reply #24 on: April 14, 2012, 09:26:57 PM »
My Jeffersonia seeds never germinate - in pots nor self sown

Seeds of both species have germinated this spring. They were sown straight from the capsule.
Chorley, Lancashire zone 8b

Lesley Cox

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Re: Dividing Jeffersonia dubia
« Reply #25 on: April 15, 2012, 12:58:12 AM »
I think fresh may be the answer for seed. I collect my own of dubia, but true to type, procrastinate as I do with much in my life so that I have literally never had a seed germinate. But year before last a west coast Canadian Forumist send me seed of both dubia and diphylla, fresh from his garden and the former germinated well, nice little plants now. Diphylla hasn't come up though. Same probably applies to Ranzania japonica. Swedish fresh seed has germinated very well.
Lesley Cox - near Dunedin, lower east coast, South Island of New Zealand - Zone 9

TheOnionMan

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Re: Dividing Jeffersonia dubia
« Reply #26 on: April 15, 2012, 04:08:38 AM »
Yes Lesley, I think sowing fresh seed is the key, then keeping them just moist enough and kept shaded all summer, and exposed to the elements over winter, and they germinate like cress.

Here's a photo of a Korean form of J. dubia, it differs from the form typically in cultivation by having red ovaries and dark stamens.  I have a flat of seedlings of this one coming along too.
Mark McDonough
Massachusetts, USA (near the New Hampshire border)
USDA Zone 5
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Lesley Cox

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Re: Dividing Jeffersonia dubia
« Reply #27 on: April 15, 2012, 06:21:59 AM »
That red ovary makes for a very attractive plant. It looks quite smiley. :)
Lesley Cox - near Dunedin, lower east coast, South Island of New Zealand - Zone 9

KK-Ann Arbor

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Re: Dividing Jeffersonia dubia
« Reply #28 on: April 15, 2012, 11:34:35 AM »
Mark, Korean form of J. dubia is nice!. 
Also, I did not know but Ronm mentions blue form of J. diphylla.
Are Korean form of J. Dubia and/or blue form of J. Diphylla available in the US?

Koko
 

in Ann Arbor, Michigan, USA - USDA Zone 5a

TheOnionMan

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Re: Dividing Jeffersonia dubia
« Reply #29 on: April 15, 2012, 02:13:45 PM »
Koko, I suspect that Ron's mention of blue and white diphylla was a slip, and dubia was probably what he meant. J. diphylla, as far as I know, is always a white-flowered species, not sure if there are even pink-tinged forms.

Just checking Google images, there are sometimes plants of J. dubia that come up mislabeled as diphylla.  By the way, here's a photo of a lovely purple-leaf form of J. dubia:
http://www.flickr.com/photos/spellboundgarden/7037459361/
Mark McDonough
Massachusetts, USA (near the New Hampshire border)
USDA Zone 5
antennaria at aol.com

 


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