The oncidium, an orchid taken from collectors, everyone’s door


In this video, Florian from l’Orchidium explains how to cultivate the Oncidium, an orchid prized by collectors but whose ease of cultivation puts it within the reach of all amateur gardeners.

Get to know the Oncidium better

The Oncidium is an orchid sympodiale native to tropical America, which found from Argentina to Florida via Ecuador.

It grows in forests where it clings to the branches of trees, so it is in the majority of epiphytic cases, although among the more than 750 species in the genre, there are terrestrial forms.

Its flowering, sometimes slender, sometimes compact, is very delicate and airy. There are many cultivars such as the much sought after ‘Cherry Baby‘which distills a delicious fragrance of vanilla and chocolate. Other varieties are appreciated only for the splendor of their flowers because they are not fragrant. Flowering lasts at least a month and a half. This orchid never blooms again on the same flower stalk but from a new inflorescence.

Culture of the Oncidium

This orchid is easy to grow in an apartment ; unlike many other species, it does not need to be put outside during the summer months to be able to bloom again. Temperature differences of at least 5 ° C between day and night are sufficient for it to ensure a new flowering. For that, you can simply open the window in front of which is installed your orchid, during all the beautiful season, it will thus benefit from the freshness of the nights.

A good rate ofhygrometry is also necessary for the cultivation of this tropical orchid, be sure to maintain it between 60 and 70% humidity.

Ideal location

Place the Oncidium at most near a window so that the plant benefits from bright light without sun direct at midday which could cause irreversible burns on the aerial parts. However, the morning or evening sun is very popular.

If you’re lucky enough to own a garden, don’t hesitate to take it out under a tree in a shady area in summer. It will thus benefit from a better humidity rate and a good thermal amplitude between day and night.

Temperature

This orchid enjoys a temperature between 14 and 26 ° C. It needs a thermal amplitude between day and night to flower properly.

Hardiness

This orchid of tropical origin is frost.

Do not expose it to temperatures below 10 ° C.

The frost is fatal to it, if you take it out to the garden in summer, think about bringing it in before the first frost.

Watering

Sprinkle with soft water in soaking the base of the pot in water at room temperature once a week in summer. Leave it substrate soak up completely before removing the plant from its bath.

Allow the pot to drain before placing it back in its cup or pot. The roots must not remain soggy in order to avoid their rotting or the development of fungal diseases.

In winter, space the waterings every 10 days.

This orchid needs a high level of hygrometry (+ 60%). Place the pot raised by wedges in a large dish containing clay balls kept moist. Spray its foliage and especially the aerial roots with water non-calcareous twice a day in hot, dry weather. Avoid placing it near a heating source in winter, the air is too dry there.

Fertilizer

Every two weeks, after a drenching, add somefertilizer with bath water and let the plant soak for another ½ hour so that it absorbs the fertilizer.

Allow a two-month rest period without fertilizer, immediately after flowering.

Repotting

Repot the oncidium every two years in the spring.

Either the same pot size is maintained, in this case, the substrate is changed and the dead or damaged roots are cut.
If the plant has grown well, choose a larger pot for repotting and install it in new substrate.

Growing medium

The Oncidium is grown in a light and infertile substrate with a large majority of pine bark. The caliber of the bark will be medium (10 to 15 mm) and mixed with sphagnum moss with a ratio of 2/3 bark to 1/3 sphagnum moss.

After flowering

Cut the flower stalk as low as possible as soon as the inflorescence has wilted.

How to make the Oncidium bloom again?

Leave a thermal amplitude between day and night to stimulate flowering.

Take the plant out to the garden if you have one throughout the summer.

Do not forget to feed your plant with ‘Special orchid’ fertilizer very regularly because the growing medium is not very fertile.

Cut off the inflorescence as soon as the flowers have wilted.

Maintain high humidity around the plant, especially in hot, dry weather.


Source: Au Jardin, conseils en jardinage by www.aujardin.info.

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