Their soil mix is acidic and consists of perlite, some peat. The mix must drain very quickly. Orchids need bright, indirect light. During winter, you can place the plants in direct sun since the days are much shorter and the suns rays much weaker. Protect the flowers from direct sun to prevent quick fading.
Cymbidiums love water when they are actively growing.
Water them 2 to 3 times per week. Keep them dryer during winter months but never let them dry out completely. Water once a week in winter. Tap water is O-K to use but it causes salts to accumulate in the soil. Cymbidiums are very sensitive to salts in the soil.