Topic of the week: Dahlia species and related Genera

John Bryan
Mon, 14 Jul 2003 09:22:12 PDT
Hi All:
Dahlia imperalis grows to a height of some 25 feet here in Sausalito,
California, flowering in November. The flowers are mostly pendant, quite
long lasting. Stems reach 3-4 inches in diameter. Cheers, John E. Bryan

Robert Hamilton wrote:
> Hi Uli ,
> Thanks for the  introduction.
> I am  very  fond  of "Tree Dahlias" which    to  me  means the  single
> pink form of Dahlia  imperialis  which is  grown  commonly  in gardens
>    where I  live. It  grows  to  about  3 metres and  flowers in  early
> winter before heavy  frost and  tends  to  be  quite  an  open  leggy
> plant. I  also  grow a semi double  white form which  is not  so  tall
> - about  2 metres and a  much  more dense clump  -  to  my  eye a  much
>   better garden  plant . Unfortunately  it  flowers several  weeks
> later than the  single  pink and  therefore  is  not  often  enjoyed.
> This  year our  winter  was quite  mild  until   June  21 (our
> shortest  day) and  I  had a  nice display of  flowers almost  ready
> to  photograph. We then   had  -2C  and  -1C two nights in a  row  .
> Next  weekend I  cut them  all down (saving  plenty of  cuttings.)
> I  grow them in  full sun and  wind in  our new  garden  hoping that in
> years  to  come  as  trees and  shrubs  grow they  will get  more
> protection from  frost.
> I  also  grow  Dahlia coccinea var palmeri thanks  to  Uli and  find it
>   flowers almost  continuously  from summer  to  frost. For  me  thus
> far  it  has only reached 1 metre tall and is  also a   wonderful
> garden  plant.
> I have  raised 4  seedlings  of  Dahlia merkii this  year  so  should
> be able  to  share my  experiences with this  next  summer.
> Cheers,
> Rob in Tasmania
> Zone 9
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