Cosmos atrosanguineus

Jerry May
Sun, 16 Sep 2012 08:53:34 PDT
I grew C.atrosnguinea for several years ,leaving it in the ground over winter.It did not florish,but hung on to life tenaciouly.During thia time I tried pollen of dahlias,cosmos,and one local bidens specie.Nothing worked of course.What is the basis for placing this in Cosmos? I am a rank amateur but this looks more like bidens than the several other choices one might have. 
As for New Zealand as a source of seed ,I wonder wether someone made a trip to Mexico
 Oh,I even tried grafting onto Dahlias
Jerry May
Deanna Potts

From: Peter Taggart <>
To: Pacific Bulb Society <> 
Sent: Sunday, September 16, 2012 11:17 AM
Subject: Re: [pbs] Cosmos atrosanguineus

see here
the plant grows easily enough protected from hard frost, it dosn't have
substantial 'tubers' for drying in winter like some of the garden Dahlias

On Sun, Sep 16, 2012 at 3:25 PM, James Waddick <> wrote:

> Dear Friends,
>        I am sure regular readers of this forum and of the wiki are
> aware of the odd history of this tuberous species. See
>        The plant was originally collected in Mexico, then believed
> to have become extinct. All cultivated plants are a single clone
> propagated by micro-propagation or division of its Dahlia-like
> tubers. The plant is sterile and produces no seed.
>        A few years ago a fertile  seed strain was 'discovered' in
> New Zealand and has slowly entered cultivation.  Seedlings can be
> crossed with the established clone to produce fertile seed and at
> least a couple of new cultivars have been developed.
>        By an odd coincidence I was recently given a small quantity
> of seed of  this still very rare plant. ......

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