RE: Centaurea hypoleuca 'John Coutts'

thank you so much.  Great detailed notes.

> -----Original Message-----
> From: Daryl & Julie [l*@earthlink.net]
> Sent: Wednesday, November 10, 1999 11:17 AM
> To: perennials@mallorn.com
> Subject: Re: Centaurea hypoleuca 'John Coutts'
> 
> 
> Greetings,
> According to the RHS Index of Garden Plants, Centaurea 
> dealbata and Centaurea
> hypoleuca  are closely related.  The cultivar most commonly 
> seen in gardens is
> C. hypoleuca 'John Coutts.'  Both are perennial.  There are 
> excellent pictures
> of both species on page 152 of Roger Phillips and Martyn 
> Rix's book Perennials,
> Volume II.  C. hypoleuca is rated hardy to Zone 5 while C. 
> dealbata is hardy to
> Zone 3.
> I have grown both of these from seed.  They are simple warm 
> germinators.  Both
> needed two years to produce flowers from seed.  Neither was 
> invasive in my Zone
> 7 garden.  However, I did have a problem trying to contain 
> Centaurea montana,
> the perennial blue bachelor's button.
> I felt that the dealbata had more of a purple undertone to it 
> while the
> hypoleuca was more a bright candy-cotton pink with a whitish 
> center.  The
> hypoleuca had less petals and was more of a branched plant 
> while the dealbata
> had more substantial flowers  and (in my eye) the petals were 
> held more
> upright.  One other difference--the dealbata often had a 
> "ruff" of leaves
> surrounding the flower head, a feature absent in hypoleuca.  
> C. dealbata is
> available as seeds from Thompson and Morgan.  For a photo see
> http://www.hillier.hants.gov.uk/gallery/centaur.html
> 
> Seed of C. hypoleuca is available at
> http://www.discoveredmonton.com/devonian/seedhper.html
> Best,
> Julie Finn
> Zone 7 and 10
> 
> 
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