During
the early part of my presentation regarding the Angraecum Alliance, I stress
the fact that many of the alliance do not do well in the blooming department if
the roots are bothered or disturbed too much.
In other words, they become somewhat dormant when it comes to blooming
for as long as and up to five years. You
will see this mentioned in various posts throughout the blog. This particular post is going to address that
probability in depth dealing with an Angraecum eburneum along with the culture demands of this species.
Angraecum eburneum ssp. giryamae or
Angraecum giryamae (the specific
species in this post) as it is now classified as well as two other sub-species
of Angcm. giryamae hail from various
locations such as Madagascar, the Mascarene Islands, the Comoro Islands and
East Africa; their origination depending upon the species. They are all considered sub-tropical to
tropical growers and grow in fairly moist areas as epiphytes and occasionally as
lithophytes and semi-terrestrial plants.
Exception to this is Angcm. eburneum
spp. xerophilum
grows in the semi-arid to arid areas of Southern Madagascar where there is
a 3 – 5 month dry or dormant period during the winter months in the Southern
Hemisphere (this species is discussed indirectly as one of the parents in the
post “Birth of a Shooting Star”).
Image 01 Image 02
Several days after giving the
Angraecum presentation to one of the South Florida Orchid Societies, I received
an email along with a photograph attached showing an un-named Angraecum that
had grown so much that it had pushed itself out of the pot. The plant appeared to be Angcm. giryamae and was in excellent
health. No sign of stress or any severe
batches of fungus. It had very strong
leaves of green with numerous secondary plants and a few kiekies (Images #01 $
#02).
The root system was visible (and
there were many), most were 3/16 – 5/16 inches (.4 - .6cm) wide. There was also a substantial number of new
roots with green tips almost 3/4 inches (2cm) long. It is this root system that shouldn’t be
disturbed. I always explain that when
potting or placing certain species of Angraecums in baskets; you should use a
container that will not need to be changed later. Let the plant grow into it! Angraecum giryamae
can reach a height of 4 – 6 feet (1.2 – 1.8m); although a plant in culture will
very seldom reach a height of over 4 feet (1.2m).
The instructions given to the plant
owner were followed exactly as given.
She had a 12 inch (30cm) square by 6 inch (15cm) deep cedar basket
prepared for the transfer of the plant. The medium was a mixture of charcoal,
perlite, tree fern pieces and coconut chunks that were considered to be medium
size. She very carefully used a small
hammer and broke the pot up around the plant’s base root system. She did not pull any of the broken pot pieces
off of the roots. Whatever fell off at
the time of breaking the pot is what was thrown away. Any of the old medium that was still stuck to
the root system was left alone. 
Image 03
The plant was then placed into the
cedar basket and the new medium was placed into the basket around the
plant. Then very carefully working the
new medium into the voids in and around the plant. Once the plant was settled into the basket,
it was watered and a systemic fungicide was used to treat the plant. It was placed in the same area receiving the
same amount of light and care has it had previously (Image #03).
During the summer months, the plant was watered about every three days, fertilized once a week and a systemic fungicide is used about every four weeks. Patience now has the upper hand; will the plant lie dormant or will it bloom?
During the summer months, the plant was watered about every three days, fertilized once a week and a systemic fungicide is used about every four weeks. Patience now has the upper hand; will the plant lie dormant or will it bloom?
Images 04
Late this summer, the plant starting putting out an inflorescence; a very good indication that it would bloom. Watching it develop and finally seeing the first buds appear gave even a higher degree of hope that the re-potting of the large Angraecum was a success. As you can see in the following image, the Angraecum giryamae successfully bloomed (Image #04).
Not every transfer or re-potting of a mature Angraecum will be this successful. Root systems are used by this genera as any other. Supply the plant with moisture and stability. But, the root systems are much more sensitive. If the roots are disturbed too much, they will become dormant for an unusual amount of time; not blooming and slower growing for several years. That is why I stress to hobbyists to find out how large the plant will get and then placing that plant into a pot or basket to accommodate the plant as a mature adult. Keep in mind that the medium must be thoroughly thought about also. Do not use a mixture of materials that will decompose. It will cause problems with mold, mildew and funguses that may kill the plant faster than you can treat it.
[The plant in this post belongs to Patt Lindsey; a hobbyist here in South Florida. She supplied all of the photographs as well as doing the repotting. Congrats to you Patt. A job well done!]
