Oncidium stelligerum

Also known as: The Star or Oncidium stelligerum h.v. ernesti in the subfamily: Epidendroideae

Native to: Guatemala Guerrero - Mexico

General Information

The Star is a large sympodial cool to warm growing epiphytic orchid belonging to the sub family Epidendroideae native to Guatemala and Mexico.

Plant Description

Sympodial. Grows to 48-53cm. Each new growth has numerous leathery arching, elliptic, oblong shaped leaves that grow to 3-40cm long. Pseudobulbs grow to 3.5-13cm

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

The orchids are well adapted for hot weather, accompanied by sporadic, unpredictable rainfall and a generally dry climate. They can tolerate a lot of neglect as they are quite used to it, however they can be prone to underwatering and may collapse in cold, wet weather.

For this reason it's best to dedicate a sheltered, protected area for them where the watering can be controlled, such as a corner of a greenhouse or in a sheltered balcony. They can also do well hung near the roof of a shadehouse or sheltered greenhouse where they receive the extra heat but not as much water as other plants. 

Grows at high elevations. Rainfall ranges from 0mm to 132mm per day, heaviest in July and lightest in December. Temperature ranges from 12C to 32C, highest in April (18C to 32C) and lowest in January (12C to 28C).

Watering

These orchids are sensitive to excessive watering and should only be watered when they look thirsty. Water infrequently and ensure that the roots are dry before watering. Keep an eye on them especially during hot weather as overwatering can lead to rot, whereas underwatering may result in wilting or shriveling, which while unattractive, will not kill the plant.

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,