The National Begonia Society
HOME PAGE    SOCIETY    SHOWS    MEMBERS GALLERY    DIARIES    MAP  
 CULTURAL     REGISTER OF VARIETIES     POTS & BLOOMS     UPDATES     LINKS

.

.


CULTURAL DIARY   2016

Tim Jemmott

Begonia Species

.

November 

A sometimes neglected group of species begonias are those classified as think stems and they are often grouped together with the upright rhizomes. These are large plants with stout usually non-ramified [unbranching] stems with a few leaves at the top of the stem.  They are sometimes referred to as the trees of the begonia world, however, there are no true trees in the begoniaceae.  I am currently growing two thick stem plants in my collection of plants from section Gireoudia; B.satorii, B. multinervia,.

As far as I know there is one thick stem begonia available, that is a hybrid called B. Gryphon which was in garden centres a few years ago.  It is said to be quite cold tolerant [50C].
B. carolinifolia is the most accessible of the plants described, being available from Dibbley’s and other suppliers as a plug plant.

B.satorii is found in Mexico and Guatemala.  It can grow up to 2.5m tall.  It has glabrous green leafs on their upper surface and red on the under surface.  B. sarcophylla is a synonym for B. sartorii.
B. multinervia
grows up to 3m tall.  It has bright green lancellate stipule.  It is found from Nicaragua to Panama

My collection has several examples of begonias with upright rhizomes e.g. B. carolinifolia, B. cardiocarpa, B. sericoneura,
B. kenworthyae.

B. carolinifolia is found in Mexico and Central America at an altitude of about 1100m.  It has a large upright rhizome, with a large, attractive compound palmate leaf, the petioles and underside of the leaves of this plant have rust coloured hairs, which, are more apparent on young leaves.  These features distinguish B. carolinifolia from B. thiemie, which, has a repent rhizome and is practically hairless.  It can grow up to a metre in height.  

B. cardiocarpa is another plant with an upright rhizome and is found from Honduras to Costa Rica.  It’s a rigorous plant growing quickly to a high of 60cm in height.  The leaf margin is ciliated.  The rhizome and large leaf veins on the underside of the leaf are covered with hairs.  It is closely related to B. manicata.

B. sericoneura is thick stem Begonia.  It is found from Mexico, through Central America to Columbia.  It varies greatly in form across its range.  I am growing two examples see pictures below.

B. kenworthyae is endemic to Mexico.  It has leaves with 5 lobes and are grey/green in colour.

Most plants can be cared for using the standard conditions as described by Tebbitt [2005].  Some plants may require a large heavy pot to counter act the weight of the plant.  Plants can be encouraged to grow multiple stems by pruning the primary stem to just above the soil level.  This requires some bravery, but, you can make cuttings from the portion of stem removed.


B. thiemie

         
                 B. sericoneura                  B. sericoneuria [lindleyana]


B. kenworthyae.


B.satorii

  
B. multinervia


B. Gryphon

         
B.carolineifolia

              

Diary Introduction     February     March     April     May     June     July     August & September     October     December

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

TOP OF PAGE

D