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Author Topic: Bulb Log 28/07/07  (Read 3085 times)

hadacekf

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Bulb Log 28/07/07
« on: July 12, 2007, 07:00:35 PM »
Ian,
Your last Bulb Log about re-potting of bulbs is very interesting and it gives many pieces of advice. Thank you.
Franz Hadacek  Vienna  Austria

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tonyg

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Re: Bulb Log 28/07/07
« Reply #1 on: July 12, 2007, 09:30:47 PM »
As Franz says, lots of interesting info in this BL.  I am very interested in the comments about crocus corms.  As you might expect I get to see quite a few of them at this time of year.  I have experienced all the phenomena that Ian shows.  I am of much the same opinion  on most counts.  However I would not be happy planting my corms so close to the bottom of the pot.  I want them to have a bit of compost under them to feed the new corms for next year.  Do your roots grow upwards Ian? ;)  The downward migration of corms occurs mostly in the species from habitats with severe summer drought, I have seen corms with a similar 'string of old tunics' myself.  Perhaps this is more a natural feature of these plants than a 'need'.  I think they will grow just as well if planted at a conventional depth.
The idea that virus may be responsible for the poor condition of some corms has occurred to me also.  I don't think it is the only factor that can cause the problem.  What taxa is the picture of?  I have had a problem with virus in C serotinus which has had similar effect, this species seems especially prone and I have discarded all the suspect material this year.
Watering issues are varied.  Does insufficient/erratic watering at the start of the growing season result in less extensive rooting?  If so this would have a serious negative impact on the development of a strong and healthy corm for the next season.  This spring temperatures rocketed very early with pots drying out quickly, failure to keep up the watering at the end of the season can result in premature dormancy although the high temperatures alone can be a sufficient trigger.  Premature dormancy will seriously effect the size of new corms and the amount of resorbtion of the old corm.  This has been a significant problem here this year but not as serious as I feared at the time.


Ian Y

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Re: Bulb Log 28/07/07
« Reply #2 on: July 13, 2007, 01:16:12 PM »
Thank you Franz for your comments I am often worried that others will be bored of looking at the bulbs and not flowers - I think the bulbs are often even more interesting.

Tony you make many good points and I agree there are many factors that can cause these symptons we are seeing in our crocus.

I do believe that bulbs in general are more sensitive to how much compost is above them than they are to how much is below them. I find that the roots will rise up above the level of the corm/bulb as well as escaping down into the sand plunge.

I will be returning to this subject several times in coming logs as my repotting progresses and I discover more food for thought.
« Last Edit: July 13, 2007, 01:30:34 PM by Ian Y »
Ian Young, Aberdeen North East Scotland   - 
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Lesley Cox

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Re: Bulb Log 28/07/07
« Reply #3 on: July 14, 2007, 02:58:41 AM »
Never bored Ian, after all, if there were no bulbs to start with, there'd be no flowers to follow. Only those who are themselves terminally boring would not welcome the chance to learn more, as we do everytime there's a new edition of the excellent Bulb Log.
Lesley Cox - near Dunedin, lower east coast, South Island of New Zealand - Zone 9

David Shaw

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Re: Bulb Log 28/07/07
« Reply #4 on: July 14, 2007, 08:34:42 AM »
The bulbs are often as interesting as the flowers - think of Fritillaria and Arisaema. One of the benefits of growing in pots is that you get to appreciate the bulbs and makes the task of repotting so much more exciting at this time of year.
David Shaw, Forres, Moray, Scotland

 


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