We hope you have enjoyed the SRGC Forum. You can make a Paypal donation to the SRGC by clicking the above button


Author Topic: South African Bulbs/Geophytes 2019  (Read 20455 times)

GordonT

  • Sr. Member
  • ****
  • Posts: 381
  • Country: ca
Re: South African Bulbs/Geophytes 2019
« Reply #180 on: August 15, 2019, 02:20:06 AM »
Anthony, I believe the colour difference may have something to do with temperature and light during growth.

The late Dr Carl Withner described a similar issue with the genus Sophronitis, particularly Sophronitis coccinea. The red pigment is an anthocyanin, and its production is dependent on available sugars. When warm bright temperatures persist throughout the day, plants utilise most of the sugars they produce, just to maintain growth. With warm, bright days are followed by cool evenings, the plants have a sugar surplus that they can afford to use in producing anthocyanin pigments. 

The varied colour concentration in your flowers may be due to this sort of thing having happened, cooler and brighter when the richly coloured flowers developed.

Southwestern Nova Scotia,
Zone 6B or above , depending on the year.

ArnoldT

  • Hero Member
  • *****
  • Posts: 1775
  • Country: us
Re: South African Bulbs/Geophytes 2019
« Reply #181 on: August 15, 2019, 01:26:01 PM »
Gordon:

Wow, Carl Withner.

I was an undergraduate at Brooklyn College and had the chance to meet him on a couple of occasions.

He was a Prof there and ran the greenhouse top of the science building.

Always enjoyed his conversations.

Arnold Trachtenberg
Leonia, New Jersey

Tomte

  • Newbie
  • *
  • Posts: 29
  • Country: de
Re: South African Bulbs/Geophytes 2019
« Reply #182 on: August 15, 2019, 02:38:25 PM »
Nerine masoniorum is flowering here for nearly a month now.
This little beauty took many years to flower at all and had the first flower only last year, but now is seems to be taking off.. I grow it in my gritty standard bulb mix in a pot outside and keep it bone-dry in winter in a cooler place in the house.
A little past its best now, but still nice.
If anyone from within Germany would like some seeds (as they are thick and fleshy and should be sown immediately, and international letters not containing only documents have gotten pretty expensive recently), please PM me.. A few seeds should certainly develop.
Tom S.
Balcony gardening in Munich, Bavaria

jshields

  • Hero Member
  • *****
  • Posts: 667
  • Country: us
    • Shields Gardens
Re: South African Bulbs/Geophytes 2019
« Reply #183 on: August 15, 2019, 09:15:18 PM »
I think many flower species show a sensitivity of the intensity of their orange and red flower colors to the amount of light they are exposed too.  Production of red anthocyanin pigments in foliage and stems is a protective response to high levels of light and UV striking the plants.

It affects me here when I buy a nice rich red flowered Clivia plant in Southern California and it turns out to be barely red-orange when it later blooms here in Indiana.

Jim
Jim Shields, Westfield, Indiana, USA
http://www.shieldsgardens.com/Blogs/Garden/index.html

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #184 on: August 16, 2019, 07:29:19 AM »
Romulea tetragona has bright flowers and the exteriors are feathered like some forms of crocus!
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #185 on: August 16, 2019, 04:03:13 PM »
Bulbinella latifolia ssp doleritica - I'm resorting to covering the plant every time frost is predicted to protect the flowers!
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

Maggi Young

  • Forum Dogsbody
  • Global Moderator
  • Hero Member
  • *****
  • Posts: 41614
  • Country: scotland
  • "There's often a clue"
    • International Rock Gardener e-magazine
Re: South African Bulbs/Geophytes 2019
« Reply #186 on: August 16, 2019, 04:25:15 PM »
Bulbinella latifolia ssp doleritica - I'm resorting to covering the plant every time frost is predicted to protect the flowers!
cheers
fermi
Worth the  effort though, fermi!  How  much frost  could  they take, do you  think?
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!


"Beauty is in the eye of the beholder and it may be necessary from time to time to give a stupid or misinformed beholder a black eye."

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #187 on: August 17, 2019, 09:27:24 AM »
Hi Maggi,
the plant itself can take it as low as -7oC but the flower stem is susceptible to temperatures below -4oC I think.
Other Bulbinellas like Bulbinella eburnifolia eburniflora [thanks to Erle for the correction] seem imperious to the cold
cheers
fermi



650214-1
« Last Edit: September 24, 2019, 10:38:54 AM by Maggi Young »
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #188 on: August 17, 2019, 09:56:14 AM »
Bulbinella floribunda is also in flower and B. robusta and B. cauda-felis aren't far behind
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

Maggi Young

  • Forum Dogsbody
  • Global Moderator
  • Hero Member
  • *****
  • Posts: 41614
  • Country: scotland
  • "There's often a clue"
    • International Rock Gardener e-magazine
Re: South African Bulbs/Geophytes 2019
« Reply #189 on: August 17, 2019, 12:58:38 PM »
I really  like these  Bulbinellas -  thanks  for  showing them, fermi
Margaret Young in Aberdeen, North East Scotland Zone 7 -ish!


"Beauty is in the eye of the beholder and it may be necessary from time to time to give a stupid or misinformed beholder a black eye."

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #190 on: August 19, 2019, 12:48:49 PM »
The sweetly scented Babiana odorata grown from Silverhill Seeds many years ago.
The final pic is a hybrid which has arisen from this species crossing with Babiana pygmaea
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #191 on: August 20, 2019, 10:30:39 AM »
Moraea tripetala in flower now
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

Rimmer de Vries

  • Journal Access Group
  • Hero Member
  • ******
  • Posts: 789
  • Country: us
Re: South African Bulbs/Geophytes 2019
« Reply #192 on: August 22, 2019, 08:43:22 PM »
 Brunsvigia striata (B. minor) in bloom now.
Rimmer
Bowling Green, Kentucky USA
USDA zone 6b-7a
Long hot humid summers
Cool wet winter

Diane Whitehead

  • Queen (of) Victoria
  • Hero Member
  • *****
  • Posts: 1228
  • Country: ca
Re: South African Bulbs/Geophytes 2019
« Reply #193 on: August 31, 2019, 09:58:07 PM »
I've grown about a dozen species of Tritonia from Silverhill seed, and think this is T laxifolia even though I have it marked in a different bed on my garden map.  It is flowering now, in late summer, and the little yellow strips on the lower tepals are distinctive.
« Last Edit: September 01, 2019, 01:17:41 AM by Diane Whitehead »
Diane Whitehead        Victoria, British Columbia, Canada
cool mediterranean climate  warm dry summers, mild wet winters  70 cm rain,   sandy soil

fermi de Sousa

  • Far flung friendly fyzzio
  • Hero Member
  • *****
  • Posts: 6429
  • Country: au
Re: South African Bulbs/Geophytes 2019
« Reply #194 on: September 09, 2019, 02:20:54 PM »
Hesperantha latifolia with interloper!
I presume the larger one is a hybrid perhaps with H. pauciflora which we also grow
cheers
fermi
Mr Fermi de Sousa, Redesdale,
Victoria, Australia

 

In Association with Amazon.co.uk


Scottish Rock Garden Club is a Charity registered with Scottish Charity Regulator (OSCR): SC000942