Propagation: Attempt to germinate very old Acer pentaphyllum seeds

Discussion in 'Maples' started by maf, Mar 5, 2022.

  1. Soumil Yarlagadda

    Soumil Yarlagadda Well-Known Member Maple Society

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    amazing! the fact that they are 10 years old!
     
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  2. maf

    maf Generous Contributor Maple Society 10 Years

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    It is two months since planting the seeds, so time for an update:
    IMG_20220504_184202.jpg

    The two that sprouted are doing very well in the greenhouse and have been up-potted to one litre containers. Each new set of leaves is looking closer to the adult leaf shape. They look so healthy!

    The other three pots showed no signs of sprouting so I moved them to the fridge, bagged, for a cold treatment about five weeks ago. I am 99.9% sure they will be dead, as I do not think they can survive very long outside of the nutlet, but will bring them into the warm soon and give them a final chance.
     
  3. Acerholic

    Acerholic Paragon of Plants Forums Moderator VCBF Cherry Scout Maple Society

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    Great to see you have two healthy Acer pentaphyllum M. The more of these endangered maples that are grown the better.
     
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  4. Soumil Yarlagadda

    Soumil Yarlagadda Well-Known Member Maple Society

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  5. maf

    maf Generous Contributor Maple Society 10 Years

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    I think they are both alive. One is definitely alive and started leafing out from the lower trunk a couple of weeks ago in the greenhouse, and now starting to leaf out higher up. I think the other has buds swelling but no leaves yet. Will have to check the greenhouse tomorrow.

    Seems to be normal for one to be farther ahead than the other, the older ones are at various stages of starting to leaf out or buds swelling also.

    When they are leafed out properly I will add some pictures.

    As an aside, keeping Acer pentaphyllum in a greenhouse over the winter and spring in UK climate seems to bring leaf out forward by around two to three weeks - the older plants which used to be kept outdoors would break bud around the end of May or early June, the last two years in the greenhouse it has been mid-May.

    And they will be coming out of the greenhouse for the summer very soon....
     
  6. Ian Stanton

    Ian Stanton New Member

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    This is a very interesting thread @maf! How are they doing this year?
     
  7. maf

    maf Generous Contributor Maple Society 10 Years

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    Still in the greenhouse this year, I tend to keep them in till they are well into the leafout process which usually equates to earlyish May (when in the greenhouse). They are far and away the latest maples to emerge in spring (sometimes summer!) that I have grown. The 2 small ones germinated in 2022 are both alive, around a foot tall and seemingly very healthy. I will post pictures probably around June when they are fully leafed out. I know I missed pics last year but this year for sure.

    I also have 3 older ones which are doing well. I have not lost any of them since I started overwintering them in the greenhouse. In years previous when overwintered outside near the house I would lose the odd one every year or so. After discussion with @emery we both seem to think that it is the winter wet in the UK/Northern France that kills Acer pentaphyllum rather than the absolute cold temperatures. I have seen -10C temps not bother them and he has had ones survive to -15C, but both of us have lost plants in milder winters, presumably because of a combo of wet and fairly cold for long periods.

    A more general question, has anyone seen any A. pentaphyllum plants persist long term in the UK climate when planted in ground? I know I saw some small ones at Westonbirt that failed after a few years, and cannot remember ever seeing a large one at an arboretum. Given what I know about their winter survival trends when grown in pots, and that their native habitat in China is on steep mountain sides, I would suggest the hypothesis that the best prospect for in ground cultivation in the UK is in mounds or berms of well draining substrate raised 30-60cm (1-2 feet) above grade.
     
  8. Ian Stanton

    Ian Stanton New Member

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    PXL_20240424_124121209.jpg
    Here is a mature pentaphyllum, planted in St James's Park, London. Behind a Shishigashira, by the lake, and nearest to the Buckingham Palace entrance. What three words ///hulk.spine.deeply.

    I was able to identify it via a web page that shows the tree, link here.

    https://www.treesandshrubsonline.org/articles/acer/acer-pentaphyllum/

    My photos attached,including two of the base which maybe help with your question about planting. PXL_20240424_123056587.jpg PXL_20240424_123026782.jpg PXL_20240424_122001209.jpg PXL_20240424_121944354.jpg PXL_20240424_121857675.jpg PXL_20240424_121807616.jpg
     
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  9. maf

    maf Generous Contributor Maple Society 10 Years

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    Magnificent! How tall do you estimate it to be? I will have to try and see it for myself one day.

    Well, that blows my theory out of the water (no pun intended) - you can't get much wetter roots than a lakeside planting. Interesting also to note that the link you posted references a pentaphyllum that is at the Ventnor Botanic Garden, Isle of Wight, known as the hottest garden in the UK. Central London is also one of the least cold parts of the UK, so we are back to cold tolerance as the likely limiting factor for long term survival.
     
  10. Ian Stanton

    Ian Stanton New Member

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    Guessing the height of trees is not my strong point. It seemed pretty tall.
     

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