Monsoon Care for Cymbidium Orchids

Dr. SURAKSHA RAI, Dr. KALAIVANAN, N. S and Dr. S. P. DAS ICAR-National Research Centre for Orchids,

Cymbidiums are perhaps the most rewarding of all orchids for the home gardener, but they demand proper care in their seasonal growth requirements. The Cymbidium with their long-lasting spikes and beautiful blooms that grace our gardens and flower shows from November through January is the direct result of how well the plant has been managed during the preceding monsoon months. The bumper productivity of gorgeous spikes mainly relies on the how well these plants are managed during monsoon season.

The monsoon season that is from June through August in most parts of the country, coincides with the peak vegetative growth phase of the Cymbidium. This is when the plant is putting all its energy into building new pseudobulbs, extending their root systems, and developing the strong new growths from which next season's flower spikes will eventually emerge. The grower's job during these months is to support healthy growth while preventing excessive rain and humidity from causing rot and disease in the plants.

Getting the growing medium right is the first priority. Cymbidiums demand excellent drainage at all times, but never more so than during the monsoon. The recommended potting mix of cocochips, cocopeat, leaf mold and brick pieces in a roughly 3:1:1:1 ratio, with a small addition of mature, well compost cow dung provides the balance of aeration and moisture retention that these plants require. Clay pots are preferred in high-humidity conditions as they allow the root zone to breathe; black plastic pots suit drier climates where moisture retention is more of an advantage. If water does not drain freely from the pot within moments of watering, or if the drained water carries fine, soil-like particles, the medium has broken down and must be replaced promptly. A compact, waterlogged medium during the monsoon is an open invitation to root rot.

Watering must be handled with particular care when the rains arrive. During the peak growing months of June through August, Cymbidiums in most conditions will need water every three to five days, but this figure is a guide rather than a rule. Monsoon rainfall, high atmospheric humidity, and cooler temperatures all slow down the rate at which the medium dries. The only reliable way to judge when to water is to test the medium directly by inserting a finger an inch below the surface and if it still feels damp, wait for another one or two days. When watering is needed, it should be done thoroughly in the early morning, allowing any moisture on leaves or in the crown to dry well before evening. Overhead watering should be avoided throughout the monsoon and cool season, as moisture sitting on foliage overnight is a primary trigger for fungal infection.

High humidity during the monsoon also brings an increased risk of Phytophthora, a devastating fungal disease that can rapidly compromise the health of Cymbidium plants if left unchecked. It thrives precisely in the conditions that an unmanaged monsoon creates like waterlogged medium, poor air circulation, and persistent moisture. Early signs include blackening of roots, yellowing of lower leaves, and an unpleasant odour from the pot. Prevention is far more effective than cure so it must be ensured that drainage is never compromised, maintain good airflow around the plants, and never allow pots to sit in standing water even for short periods. At the same time, plants must be kept away from direct midday and afternoon sunlight, which can cause severe, long-lasting leaf burns after as little as ten minutes of exposure while the bright, filtered morning light is ideal.

Feeding during the monsoon is equally important because plants are in their active vegetative growth phase. Proper nutrition promotes the development of strong new growths, healthy pseudobulbs, and overall plant vigor. Application of organic supplements such as seaweed extract, compost tea, or panchgavya diluted at 1:20 can be applied once in 15 daysduring active growth as a gentle but effective alternative to the chemical fertilizers.

As the monsoon begins to seize through September and temperatures begin to fall, the Cymbidium moves into a quieter preparatory phase. Watering should be gradually reduced to every five to seven days in September, and further to every seven to ten days in October. This slight moisture stress, combined with the naturally cooling nights of autumn, acts as a physiological trigger for flower spike initiation. October is the month to watch: do not overwater, do not over-fertilize with and resist the temptation to move plants indoors away from the cool air. The cool night temperatures at this time of year are not a threat but they are precisely what the plant needs.

A Cymbidium that has been well fed, carefully watered, protected from the extremes of sun and waterlogging, and kept free of disease through the monsoon will announce its reward quietly in October first with the subtle swelling of a spike at the base of a pseudobulb, then with a graceful arching stem that carries ten, fifteen, sometimes twenty flowers into the November air. These blooms, often lasting weeks in perfect condition, are the rewardfor months of patients and informed care. The monsoon, in this sense, is not an obstacle to growing Cymbidiums well but it is the season that lays foundation for their beautiful blooms in the winter.