Oncidium robustissimum

Also known as: The Very Powerful Oncidium in the subfamily: Epidendroideae

Native to: Brazil

General Information

The Very Powerful Oncidium is a small to medium sized cool to warm growing epiphytic orchid belonging to the sub family Epidendroideae native to Brazil.

Plant Description

Grows to 40cm. Each new growth has a single thick lance shaped, oblong shaped leaf that grows to 7-40cm long

Care Notes

These orchids have a fine root system that can quickly die back if left dry for too long, but also does not like to be kept wet, so water regularly but ensure that the mix is dry before watering. 

Climate

These orchids thrive in cool, conditions with good airflow. When cultivated they will thrive in a cool, sheltered environment such as a shaded greenhouse, or if grown in cooler climates they can be grown in the garden in areas where they are protected from frost and receive shade throughout the year, though they may be able to tolerate some morning sun during winter.

Grows at high elevations. Rainfall ranges from 38mm to 239mm per day, heaviest in June and lightest in January. Humidity ranges from 73% to 83%, highest in August and lowest in February. Temperature ranges from 8C to 22C, highest in August (14C to 22C) and lowest in January (8C to 15C).

Watering

These orchids prefer a wet-dry cycle between waterings, they should be watered frequently but only when the moisture is approaching dryness, where the pot feels light and/or the media looks dry. Keep an eye on mounted orchids in warm weather as they may dehydrate quickly.

Potting

These plants are quite forgiving and will do well repotted ever 2-3 years. The mix should be coarse, well draining, and allow space for air to move and for roots to grow. 

Alternatively, these plants will also do well mounted to tree fern or cork slabs, or mounted to trees.

Best time for repotting or mounting the orchids is the end of winter when new growths start to appear. Avoid repotting during hot weather,