It took me many years to get a Gastrorchis francoisii. Most of the plants I bought that were labelled with Gastrorchis francoisii were mislabelled Gastrorchis humblotii. This is a picture of my first true Gastrorchis francoisii flowering. According to Lady Tankeville’s Legacy, this Gastrorchis is considered to be outstanding for the beauty of its largely pale pink blooms that are up to five centimeters across. The side-lobes of the lip are orange, spotted with red at the base.
In humid, evergreen forests of central Madagascar, at altitudes of 1200 to 1800 meters, this Gastrorchis thrives in Mandraka Valley. It was first collected by M.E. François, Inspector of Agriculture at the Botanical Garden of Tananarive. In the depths of the internet, I was able to find some cultural information about this beauty, which I would like to put together for you here:
Gastrorchis francoisii likes illuminations between 18000 and 24000 lux. Since it grows in forests, direct sunshine should be avoided. Here some references: Covered summer day at noon: ~ 20,000 lux, clear winter day at noon: ~ 20,000 lux, covered winter day: ~ 3,500 – 6,000 lux.
In summer, the temperatures at the natural location during the day fluctuate between 25 to 26 degrees Celcius and at night between 13 to 15 degrees Celcius. Thus, the night reduction should be 13 to 15 degrees. In winter, the average daytime temperatures are between 20 and 23 degrees Celcius, at night between 8 and 11 degrees Celcius. The lowering of the night temperature should therefore be between 12 and 14 degrees Celcius.
The average relative humidity may be 65 to 75 percent.
It is best to repot Gastrorchis francoisii in spring when new shoots show.
During growth Gastrorchis francoisii needs plenty of water, but without exposing the roots to waterlogging. At its natural location, Gastrorchis francoisii undergoes a wet growing period and a dry rest period, with little change in humidity.
If the plant produces new shoots, half-maximum amount of orchid fertilizer, according to the manufacturer’s instructions, may be added weekly.
Gastrorchis francoisii may throw leaves during winter rest period. The plant is hardly poured and fertilization is completely stopped.