Welcome to my 2020 GROW BLOG for the

 

Catasetum expansum ( 'Myra' HCC/AOS x 'SVO Midori' AM/AOS )

 

The parent Catasetums above are linked to a general culture and additional information page for the Catasetum expansom Click on the images below for a full-sized image in a new tab.

 

Let the fun in growing begin....

 

 

Brief Grow Blog and Pictures

 

Catasetum expansum often takes a back seat to its more popular cousin Catasetum pileatum.  I suppose this is because expansum is a bit smaller but I think it makes up for this with all of the color varieties. The two parents used here are recently awarded and represent today's standard of excellence in this species. 'Myra' is a typical expansum with green/yellow flowers covered in burgundy spots and a large darker callus, while 'SVO Midori' is an unusual deep green with yellow callus. This combination was purposely made to “pull out” as many color varieties as possible.  Rarely offered for sale, now is the time to get the best genetics for this species. ( - Fred Clarke, Sunset Valley Orchids )

 

I have two of these now and their is a noticeable difference in growth between them.  I have identified these as (A) and (B).

 

Ctsm. expansom (A):  As I was snapping pictures for the blog and taking a much closer look at this Catasetum, I was very pleased to discover it has two new growths (Right and Left based on the listing (lean) of the backbulb).  This will make blogging a little more challenging as well....

 

 

February 2020

Boxing Day - Catasetinae style.

 

Two bulbs with this Catasetum and last year's growth far surpasses the previous year's growth measuring about 5-inches in length. I inspected very closely for any sign of new growth and did not find any.  When it comes time to re-pot this Catasetum I will position the bulbs so they "ride" just below or even with the surface of moss about 2 inches deep on top of clay pellets as I grow in a semi-hydroponic environment.

 

 

 

Right

20 February 2020

I will take pics at the end of February and then archive them, but I will not be able to update commentary until late March.

 

 

On the exact opposite side there is a second new growth poking up from the moss (see image below).  I am happy when I see a Catasetum coming out of dormancy, this time I am twice as happy.  If nothing goes wrong, this particular Catasetum expansum could have 2 to 4 spikes perhaps not at the same time, but close.  A first time bloom host 5 blooms on a spike and if my math is correct, this could produce 20 blooms.  Oh yeah!!, I'm looking forward to this blooming.

 

Left

20 February 2020

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Keep in mind the Catasetinae family of orchids is dormant during the winter requiring a dry rest.  The previous year's bubl supplies all the water and nutrients for the new growth to get established and it's roots seek out a water source to tap.  This transfer of water from the backbulb to the new growth eentually will cause the backbulb to shrivel like a raisin.  Once wtaering is resumed, it should / could absorb water and become plump again.  Consider the effects on the backbulb as it supports two new growths....

 

I suspect these new growths might be a little slower to develop as the growing season progresses.

 

Obviously, I will be paying very close attention to this Catasetum hoping the new growths counter the weight of the backbulb's listing  and ending up with a balanced pot.

 

 

May 2020

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Right

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June 2020

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Left

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500 by 500 raw

June 2020

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This combination was purposely made to “pull out” as many color varieties as possible. ( - Fred Clarke, Sunset Valley Orchids )

 

Something to consider even though these two orchids have in common the same parents, there is the possibility that the bloom on each individual Catasetum can show a variance in color or slight difference in shape.  Only time will tell as the orchid matures and the bloom of each orchid becomes reliable in color and shape.

 

 

 

 

 

Ctsm. expansom (B)

 

 

 

 

February 2020

Boxing Day - Catasetinae style.

 

Two bulbs with this Catasetum and last year's growth far surpasses the previous year's growth measuring about 6-inches in length. It has a new growth peeking out from the base of last year's bulb.  When it comes time to re-pot this Catasetum I will position the bulbs so they "ride" just below or even with the surface of moss about 2 inches deep on top of clay pellets as I grow in a semi-hydroponic environment.

 

 

 

 

20 February 2020

Nobody can say that Catasetinaes when they pop out of dormancy are slow growers.  Th images above and the one left are two weeks apart in time.  Unlike its sibling above with two new growths, this one having only one new growth is well on it's way to the leaves starting to spread and roots looking for a source of water.

 

Water  will be denied for as long as possible and I will be mindfui of its orientation in my growing area to try and get the new growth almost vertical. 

 

 

 

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March 2020

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April 2020

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May 2020

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