Cedrus libani var. stenocoma seed viability?

Discussion in 'Gymnosperms (incl. Conifers)' started by treelover3, Jan 31, 2006.

  1. treelover3

    treelover3 Active Member

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    Hi all,
    I just purchased some seed of Cedrus libani var. stenocoma and very few of the seeds sank when I put them in a cup of water to soak them before sowing.

    The Pinus aristata seeds that I purchased last year all floated at first, but after a day or so sank to the bottom of the cup. I had almost 100% germination from these seeds.

    Can I expect that the Cedrus seeds that are floating may also be "good" or are the floaters a lost cause?

    I will plant them regardless, just in case, but I am curious whether there is a chance that the seed may still be good and just needs to imbibe some moisture so the seed can germinate?
    Thanks for any info,
    Mike
     
  2. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    Leave them for a couple more days (in chilled water, +1°C) to see if more sink.

    Cedar seeds don't keep very well, and if they're from a single cultivated tree, the germination may be very low, so don't get your hopes up too much.

    Wild-collected seed that I collected in Turkey a few years ago had 90% germination though.
     
  3. treelover3

    treelover3 Active Member

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    Thanks, Michael.

    More of the seed has sunk, but the cup of water, and seeds, is at room temperature (approx. 20°C or 70°F). I will put the cup and seeds in the fridge since you say the water should be at +1°C. I purchased an ounce of seeds (sorry, I don't know what that is in metric) so I will be happy if even a couple of seeds germinate.

    I know that Cedrus seeds germinate while it's still very cold outside and the seed will probably germinate once I have sowed the seeds and put the container back in the refrigerator for cold-stratification.

    Thanks, again,
    Mike
     
  4. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    Hi Mike,

    The reason for keeping the water cold during soaking is mainly because fermentation and fungal growth are fast at room temps, and these can infect and kill the seeds; also warm temps increase the seed metabolism when there is also less oxygen in the water (oxygen solubility is highest in cold water)

    Michael
     
  5. treelover3

    treelover3 Active Member

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    Hi Michael,
    Thanks. I put the seeds in the fridge last night. I will let them soak until tomorrow and then I will sow them. (I won't have the time to sow them today). Hopefully, I'll get a couple of the seeds to germinate.
    Mike
     
  6. treelover3

    treelover3 Active Member

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    Michael,
    I surface-sowed the seeds last night and put them in the fridge, in a ziploc plastic bag.

    How soon before I could expect to see germination begin (provided any of the seed is good)?
    A month, two months, longer?

    Thanks so much for your help,
    Mike
     

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