News # 34
theology, philosophy and biology, works as scientist
at the field of biotechnology in the Institute
of Plantbreeding, Bundesforschungsanstalt
in Braunschweig, Germany and also works as a high
schoolteacher in Halver, Germany. He is one of the
founders of Vereinigung Deutscher Orchideenfreunde
and their president since 1995, since 1994 the Editor
of Journal für den Orchideenfreund, author
of several articles and Editor of two books in
the field of orchids. Last edited The Dendrobiums
which won the Engler medal for best taxonomic book
worldwide in 2007. He is a speaker and judge at
WOCs and EOCs and advertiser of judging the WOC
in Dijon, France
Roland, in your lecture, you give many advices how to grow Dendrobium species.
However, you don't mention what conditions are found in your
place. Do you live in Europe, don't you? How is your greenhouse?
What could you tell about the conditions and adpations you
should have done to cultivate Dendrobium species?
RS: In my area middle of Europe we have a period from
May until September where we have good warm weather conditions
and enough light to cultivate Dendrobiums. During Winter
with low light it is very difficult to have the Dendrobiums
still alive. You have to take care in watering and even in
spraying. Because low temperatur and high humidity will lead
to leave diseases after bacterial and funghus infection.
ON: You recommend well drained substrat with pinebark,
Perlite and coconut pieces. Some people a desastrous experience
with pinebark and coconut pieces as substrate in hot and
humid environmental conditions. What could you tell us about
it? Your greenhouse has a humid enviroment?
RS: For using pinebark and coconut you have to check
every time the water condition inside the pot. And with
bad weather and low temperature as in Europe you might
have trouble with root rot. I think this will be the
same with growing in Bark
in the tropics, because bark will rot fast and
you get a damp condition inside the pot, but Dendrobiums
love to have air around
the roots. Some species do better when mounted
on a piece of bark with some moos or coconut fiber.
ON: How do you control luminosity during the winter?
RS: I am not able to control it, but in the moment
I test this new low energy Led bars. And first result better
flowers than without additional light.
ON: And about the recently discovered species you
mention, Dendrobium trantuanii and Dendrobium vietnamense?
In what kind of conditions they grow? Cool or warm species?
RS: The two new discoverd species, D. trantuanii and D.
vietnamense grow under intermedian conditions which means
15°C at night and 18°C during daytime, but with sunshine
the temperature is higher. Both species have now beginning
of march flowerbuds.
ON: You said that your interest in the Genus Dendrobium
lasted around 30 years now. It is a long way. Just for curiosity,
how many species and many plants you have?
RS: Ido not exactly know, because at beginning of
show season in spring I buy some and during winter I
sometimes loose some, but I think I have around 100 Dendrobium
ON: Which are your preffered species?
RS: My preffered species are D. mohlianum, D.
falconery and D. limpidum, but this changes often
during a flowering season. All orchids have their own charm.
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