How many centimeters should the flower buds of Chinese cymbidium (Cymbidium goeringii) and Faber's cymbidium (Cymbidium faberi) grow before vernalization can begin?

After the winter solstice, Chinese cymbidium and Faber's cymbidium with flower buds begin vernalization. For those that have already grown flower buds, once the flower buds reach a height of three to four cm and their growth rate noticeably slows or stops, they should be vernalized in an environment of 2 to 10 degrees, and the vernalization period should be no less than 30 days. For orchids that have not yet grown flower buds, carry out low-temperature vernalization around the winter solstice, and the vernalization period should be no less than 30 days and no more than 60 days.

Chinese cymbidium and Faber's cymbidium do not have to undergo vernalization to bloom, but those that have been vernalized bloom much better, flowering evenly and without the flower spike being trapped.

For an orchid to produce high-quality flowers, it must experience a period of sustained low temperature before it can shift from the vegetative growth stage to the reproductive growth stage. Simply put, orchid vernalization is letting the orchid switch from vegetative growth to reproductive growth.

Because of low-temperature dormancy, orchids almost stop growing, and what they mainly do at this time is accumulate nutrients, which are mainly supplied to the orchid's flower buds.

The purpose of orchid vernalization is to let the dormant orchid accumulate nutrients to stimulate reproductive growth, and then transport the nutrients to the flower buds so they can carry out flower bud differentiation, have enough nutrients to send up the scape and bloom, and thus achieve a very good flower presentation.

Give the orchid one round of nutrients before low-temperature vernalization; by supplying nutrients in advance, the more energy is accumulated, the fuller the flower buds will be later, and the more brightly and beautifully the scape will bloom.

The potting medium should be kept dry and must not be too moist, because at this time the orchid is in a dormant state and its life activities are inherently weak. If the potting medium is too moist, the roots will become active, which may break dormancy and end low-temperature vernalization early.