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Codonopsis

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Véronique Macrelle:
I want to collect the Codonopsis genus.
 I've been sowing what I can find for several years, with varying degrees of success, often using seeds from the srgc exchange.

Emergence is often easy, but then getting them to develop is sometimes difficult over the long term.
Maybe that's because I don't have enough information about how they live.
  This year I managed to get quite a few species
including this Codonopsis gracilis. It has beautiful foliage!
I only have one because most of the seeds were crushed in transit.


Does anyone have any information about it?
 It's already 20 cm high and wide, so could it flower this year?

Véronique Macrelle:
This is a 3-year-old Codonopsis kawakami, grown in pots outside or in the greenhouse, depending on the season.  I often have this problem of yellowing leaves, but I can't find the reason for it. Last year, it stopped its growth cycle after just 1 flower... this year I'm hoping to get a few seeds so I can grow several plants. Then I'll test it in the ground.
 
 Many other species, climbing or not, easily get chlorosis... why? Too acid a soil?

Véronique Macrelle:
in order sur la photo :
 Codonopsis ovata, Codonospis cardiophylla and Codonopsis obtusa...
 they are similar, but with slight differences in the foliage. sown in March: can I expect them to flower this year?
C. obtusa is 1 specimen, and I'm always worried about getting to winter without seeds...

Véronique Macrelle:
I was particularly pleased to find Codonopsis rotundifolia seeds this year at the srgc exchange.
a successful sowing as I have about twenty seedlings.
 I have already had this species flower, or at least a plant called Codonopsis rotundifolia var grandiflora.

It's really extra and its colour varies according to the individual, which I also like.
 she's the one that got me interested in Codonopsis in general. I did a little post on it

https://www.srgc.org.uk/forum/index.php?topic=18204.msg417310#msg417310


I know that these plants will remain at the juvenile stage this year. I've put them in a large window box so that they can develop their "carrot" to the maximum.

a bit of chlorosis here too, at times...
 the seedling on the bottom right is a companion plant, a seedling of Caiophora lateritia, sown in March: I'm testing it a bit everywhere because here again, I want to see it flower, but I don't know much about growing it.

Véronique Macrelle:
I have tried sowing Codonopsis subscaposa at least 3 times. I have kept the plants for a maximum of 2 years.
This species remains a mystery to me. I also have a bad habit of over-watering them.

 This species is slow to grow. This year I've got better growth, perhaps because I sowed them at the end of March rather than in January (when we used to get our seeds earlier in Europe).
 On the other hand, in my memory, they seemed to produce a basal rosette, whereas here they're clearly showing a stem... for an idea of size, they're in 5 cm pots (patience! :-\)

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