I'm trying to plump up a similar terete leaved vandaceous species (cleisostoma simmondii)...
Anyway, I would recommend spritzing and spritzing (ie spraying and misting) with distilled/rain/RO water with a spray bottle. Or if you municipal water is clean then that should work too. Few times a day if you can and not so much water the pot too much, the stems and roots in the charcoal could rot. The plant can absorb water and reduce water loss through stems and leaves until it begins to grow. New growths will be plumper but old leaves will stay shriveled which is the case with most orchids.
Be warned it could take time before it decides to start growing in then, but in meantime reducing water loss through transpiration will help. I'd recommend using some sort of growth stimulant which I'm not sure what's available there. There are kelp solutions here with gibberellins is what is said to help kick new growth in gear. You would mix to dilute as directed for product and soak for a long time, but just the cutting.
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There are planting beds of this in the soil all over Singapore. Just look at photos from Singapore. It's hard to miss once you get accustomed to looking for literally tons of Miss Joachim in a boulevard strip, in front of shopping malls, in parks.
Motes Orchids in Homestead sells quarter-terete Vandas for Florida landscaping, and they say to plant them in the Florida soil. You can find photos and videos on their Web site and YouTube channel.
__________________ May the bridges I've burned light my way.
I believe you have a challenge in your hands in hoping to bloom a Vanda Miss Joaquim on a balcony in Manhattan. It's ok to test and push boundaries as long as you know what the requirements are and also understand that plants have a RANGE of requirements that they can survive in and eventually bloom.
The challenges are sunlight and humidity. This plant needs as much sunlight as you possibly muster, feeding and watering has to be done according to how much sunlight it gets, and as a vanda, it needs to dry in between waterings... so... IMO keeping roots wet is likely not going to work long term.
In subtropical sun it can be watered daily and then rained upon several times daily as well and fed heavy 1 TBSP weekly or even twice weekly and when big enough it will explode in bloom. As an aside other note, plant needs to be several feet tall before it blooms. All the ones that I have grown and seen would bloom only after they have grown above whatever support they were trained in. I like to think they like to have their heads swaying in the breeze before they give you flowers. I am not trying to discourage you... but the facts are what they are.
I have seen picture of a ghost orchid bloomed in a basement in Chicago, so... where there is will there is a way...
Here is a picture of a cluster of my Vanda Miss Joaquim from the days of living n South Fla, plants are clustered inside a wire mesh tube without any media, not needed for that climate.
I have my Miss Joaquim posted 2011, so far it is still thriving in a combination of potting soil and orchid media, I had cuttings as give aways since it can grow into a large bush through the years. My Vanda Miss Joaquim orchid plant gets to be indoors on the bright southwest bay window in winter aided by an electric humidifier with fan with added extra lighting and in the warmer months it is out on the fire escape in the full sun. Manhattan has a very high humidity in the warmer months since we are an island surrounded by waters (two rivers and the sea)....
---------- Post added at 06:12 PM ---------- Previous post was at 05:46 PM ----------
Gerald,
The best thing to do is go ask your local city gardener how they take care of Vanda Miss Joaquim in your local city. Leo is right, if you look at the Malls and the island of boulevards in Singapore, the Vanda Miss Joaquim is planted in profusion and they have to trim it because it can grow into a wild bush. In fact if you are from Singapore, you can ask for cuttings when they trim the street hedges, for all you know, its only thrown away in the dump.