Cymbidium cultivation
Cymbidium are sympodial orchids, terrestrial or epiphytic, originating from Asia (up to Australia) in cold or warm regions depending on the species. The genus includes about fifty species, some of which have been used to create thousands of hybrids. Here we discuss the cultivation of hybrid Cymbidium, for botanical Cymbidium, you can refer to the product sheets which mention their origin and climate.
Cymbidiums prepare their flower stalks in the fall and bloom in the winter. In the spring they make their new pseudobulbs which continue to grow during the summer.
Growing temperatures
They are cool temperate climate orchids. These orchids will need significant temperature variations (5 to 7°C) at one time of the year, between day and night, to initiate their flowering.
You can grow your pseudobulb orchid indoors from October to May, then take it outside in the summer (out of the sun), from the end of May to the end of October, to benefit from the significant temperature variations between day and night at the end of the season. Cymbidiums are brought inside when night temperatures reach 5°C (in any case, before the first frosts). They can be grown in a veranda or an unheated (bright) room during the winter.
Exposure
In winter, you can place your Cymbidium orchid less than 50 cm from a well-exposed window. If the window you can place it in is less well-exposed, you can move the orchid closer to the glass. In summer, outdoors, choose a location with filtered sunlight.
Watering
Cymbidium orchids are grown in a fairly heavy substrate (containing potting soil, peat) since they are terrestrial orchids. Water regularly so that the substrate remains slightly moist. In the fall, before the flower stems form, watering (and fertilizer) should be reduced to encourage flowering.
Use non-calcareous water (ideally rainwater).
More watering tips here .
Fertilizer
Add special orchid fertilizer every two waterings, possibly reducing in the fall, gradually increasing in the spring. This will allow your orchid to be strong and to produce beautiful blooms when the time comes.
Repotting
Cymbidium orchids are grown in a peat-based substrate (bark can be added). This substrate should be renewed every 2 to 3 years. The Cymbidium should only be divided when it has grown well. After repotting, resume watering gradually to give the roots time to recover.