Stubborn Begonia Corm

Discussion in 'General Gardening Discussion' started by Chiaroscuro, Mar 20, 2013.

  1. Chiaroscuro

    Chiaroscuro Gardener

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    So, my favourite begonia from last year is still sitting in the airing cupboard and refusing to sprout. This is the one plant I really wanted to make it, practically every other one I overwintered is sprouting - but this one, that I took extra care over, is just staring back at me with a blank expression.

    Am I worrying needlessly - I did buy it fairly late in the season so maybe it's just a late starter? I read somewhere that if the airing cupboard trick doesn't work after two weeks that you can soak them. Anyone tried this?

    I mean look - it was lovely...
     

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  2. JWK

    JWK Gardener Staff Member

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    Gently does it, I'd take it out the airing cupboard and leave it at room temperature. I've never heard of soaking begonia tubers, sounds a bit risky because if you overwater them in the early stages they can get fungal rot.
     
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    • Dorothy

      Dorothy Gardener

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      Hi I have a few that I have been trying to grow for a few weeks now.They are on a window sill in a warm room and they are just starting to come up:huh: They are that slow, I cannot imagine them getting to a size to flower this year, unless they suddenly start rocketting
       
    • JWK

      JWK Gardener Staff Member

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      They will Dorothy :) there is a lot of stored energy in those tubers.
       
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      • Madahhlia

        Madahhlia Total Gardener

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        Aaargh - I put two tubers into rather damp compost today. I haven't grown them for about 20 years and have forgotten what they like. Should I take them out, or will they be OK if I pop them into the heated prop to get them going?
         
      • HarryS

        HarryS Eternally Optimistic Gardener

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        Keep them at room temp , they should show after approx 20 to 30 days. Then again sometimes they dont ! I lose about 25% that won't sprout , although this rate varies a lot from year to year.
         
      • JWK

        JWK Gardener Staff Member

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        Sounds like that compost is too wet, they obviously need a little water. Take them out and mix in some dry stuff if you can.

        As Harry says they can take a while to get going. Use a heated propagator if you want, I do in our unheated spare room, just to keep them at a gentle 21 deg C
         
      • JWK

        JWK Gardener Staff Member

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        By the way, the tubers should just under the surface of the compost, i.e. just buried (not deep) as roots grow from the top as well as the bottom. Get them right way up too! It should be obvious which is the top because of the scar from last years stem.
         
      • Chiaroscuro

        Chiaroscuro Gardener

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        That's what worried me regarding the soaking tip. Should I still leave the corm covered until it sprouts out expose it to some light?
         
      • JWK

        JWK Gardener Staff Member

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        Yes, keep it just covered with compost all the time (otherwise the roots never develop on the top of the tuber)
         
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        • pete

          pete Growing a bit of this and a bit of that....

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          I usually put the tubers in a seed tray with just the bottom in the compost, at about 15C, I think an airing cupboard is far too warm and might even stop them sprouting.

          Once they have a shoot or two about one inch high I then pot up, covering the tuber.

          They grow really fast once the days get longer and the temperature rises.
           
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          • Chiaroscuro

            Chiaroscuro Gardener

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            Ah right, I'd read previously not to put them in compost until they started sprouting. As all the others had started I planted them but I've been keeping this one in a box waiting for signs of life
             
          • Chiaroscuro

            Chiaroscuro Gardener

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            Thanks, I'll try this before giving up on it!
             
          • Fat Controller

            Fat Controller 'Cuddly' Scottish Admin! Staff Member

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            I lost the majority of tubers that I kept, and all of the XL ones - they got fungal rot, so I have had to ditch them.

            Never mind, the seeds I have sown are now well underway, so I won't be short.
             
          • JWK

            JWK Gardener Staff Member

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            That's a shame FC, but good luck with your seeds. They need a long time to get from those tiny seeds to a flowering plant, have you started them off already?
             
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