>From: 320083817243-0001@t-online.de (Johannes-Ulrich Urban)
>Reply-To: Pacific Bulb Society <pbs@lists.ibiblio.org>
>To: pbs@lists.ibiblio.org
>Subject: [pbs] Tropaeolum dormancy
>Date: Wed, 14 Dec 2005 00:21:40 +0100
>
>Dear All,
>
>
>I also have made the experience that some Tropaeolum tubers just do not
>sprout
>although they are firm and healthy. I grow mine in pots in a frost free
>greenhouse and keep the almost dry pots under the staging during the summer
>dormancy. T. tricolorum is very reliable and will sprout every autumn but I
>have a pot of T. brachyceras that grew for several years but now is dormant
>I
>think in its third year. I checked the pot in autumn and found a rock hard
>healthy tuber without any signs of desiccation nor damage but it just does
>not
>sprout. I do not know the reason.
>
>There are also two pots of South African Ornitohgalums that have even
>flowered
>with me but now they have that same kind of dormancy with firm bulbs that
>are
>doing their second season of un-breakable dormancy.......Hmmmmmm. Any
>advice on
>how to talk them into growth?
>
>Greetings from cold and wet AND DARK Germany..... and best wishes for
>Christmas
>
>
>Uli
Dear Uli:
It is a problem of not receiving enough "baking" during their
summer dormancy. The same thing happens with Ferrarias in cool climates.
Over here where summers are hot and very long there was never a case in
which those mild climate bulbs EVER skipped a season of growth.
It will a be a matter of finding a warmish spot in which they can receive
full sun in a black pot.
Best
Alberto
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