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Re: [Aroid-l] Amorph. titanum seedling dormancy

  • Subject: Re: [Aroid-l] Amorph. titanum seedling dormancy
  • From: "Scott Hyndman" hyndman@aroid.org
  • Date: Thu, 7 Apr 2005 19:01:29 +0500


What is your night temperature?  As you probably know, physiologically the 
night temperature has probably more of an influence on the growth of tropical 
plants like Amorphophallus titanum than the day temperature does.

Are these seedlings from the seed that Troy of Bali Orchid Garden offered 
last year?  I planted some of his second batch of seed in late summer and 
they are still actively growing with their second growth cycle leaves and 
some with their third growth cycle of leaves; no dormancy yet.  I have kept 
the seedlings at a night temperature of 75 F (24 C) and a day temperature of 
75 F to 90 F (32 C) in a greenhouse here in South Florida.

Good growing,  Scott 

On Wed, 06 Apr 2005 22:59:28 -0400, Ken Mosher wrote
> I planted 10 Amorph. titanum seeds on July 1, 2004. I got 100% 
> germination over the next 3 months, so the oldest seedlings are just 
> 9 months old.
> 4 of the 15 have entered their first dormancy in the last month. I 
> was expecting them to produce a second leaf rather than going 
> dormant, but that's not happening. The tubers on the first two were 
> the size of a ping-pong ball, approximately. Firm and healthy 
> looking. (The second two have just gone, I haven't exhumed them yet.)
> Are my seedlings behaving as others have experienced? Assuming 
> everything is OK how long should I expect them to sleep before 
> sending up the second leaf? I've been keeping the soil of the 
> dormant ones slightly moist - I believe that's right for titanum.
> The room they're in gets *very* warm during the day now that we're 
> getting better sun, so they should be happy about that.
> Thanks for your advice,
> Ken Mosher, Connecticut USA, zone 5
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