Libertia sessiliflorus

Marc Rosenblum via pbs pbs@lists.pacificbulbsociety.net
Wed, 28 Dec 2022 13:34:59 PST
Thank You

I have a greenhouse so hardiness is not an issue

Marc (8b)

On 12/28/2022 1:32 PM, Jane McGary via pbs wrote:
> Libertia sessiliflora (note spelling) should germinate readily if sown 
> in moderately cool temperatures in fall. I haven't seen its seeds, but 
> if they are relatively large, they might benefit from mild 
> scarification as some irids do, and/or from the soaking recommended 
> below to remove germination inhibitors. It is probably not 
> winter-hardy outdoors in western Oregon, where Marc lives. In nature 
> in central coastal Chile, I have seen it growing on steep slopes in 
> moist stream canyons, amid dense vegetation and near such moisture 
> lovers as Gunnera. The flowers are a rather strange shade of blue.
>
> Here is cultivation advice (my transl.) from Riedemann & Aldunate's 
> invaluable /FLora nativa de valor ornamental/: "It is propagated from 
> seed, stratified [exposed to moist chilling] in autumn or normally in 
> spring, in a soil mix of one part compost, one of sand, and half 
> garden soil, after being soaked for 24 hours before [sowing] [that's a 
> common trick with irid seed]. Transplant into pots when seedlings are 
> approximately 3 cm tall. It can also be multiplied by division of the 
> clumps, separating the rhizomes in autumn, but not too frequently, 
> only every three years, so that it can recuperate after division." 
> They also list its requirements as low light (i.e., part shade), high 
> moisture, and deep soil rich in organic matter, recommending it for 
> shady gardens near water features.
>
> Jane McGary, Portland, Oregon, USA
>
> On 12/28/2022 12:53 PM, Marc Rosenblum via pbs wrote:
>> Hello, all
>>
>> Can someone advise on how to germinate Libertia sessiliflorus?
>>
>>
>> Marc Rosenblum   (8b)
>>
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