Wipe down the blades of your cutting tool with isopropyl alcohol using a cotton ball or a clean cloth before harvesting your cymbidium orchid flowers and in between harvesting multiple flowers or flower spikes. This prevents transfer of pathogens to and among plant tissues.
Harvest your individual cymbidium orchid flowers after they have opened. Sever the flower at the base of the short stem connecting to the larger multiflower spike.
Cut off the entire flower spike after at least two of the flowers on the spike have fully opened, as cutting the spike before this may cause the flowers to fail to open. Sever the flower spike down at the base of the stem between the leaves and at least 1/4 inch above the swollen pseudo-bulb structure.