Oncidium pumilum

Also known as: The Dwarf Mule in the subfamily: Epidendroideae

Native to: Argentina Bahia - Brazil Sao Paulo - Brazil Uruguay

General Information

The Dwarf Mule is a miniature cool to warm growing epiphytic orchid belonging to the sub family Epidendroideae native to Argentina, Brazil and Uruguay.

Plant Description

Grows to 15cm. Each new growth has a single thick erect, rigid leaf that grows to 1.6-12cm long. Pseudobulbs grow to 0.3-0.5cm. The plant tends to climb or sprawl with each new growth

Flowers

Numerous blossoms appear during Winter and Spring

Blooming Season

• Spring
• Winter

Substrate(s)

• Coarse
• Bark
• Treefern
• Spaghnum Moss

Care Notes

These orchids like to be kept on the dry side, but may need to be watered daily during warm weather, and prefer a well draining mix or also do well mounted, provided they can be watered regularly.

These are quite a forgiving orchid, there are no special requirements to get this orchid to flower, just good care and consistent conditions. Larger plants may be more fussy and can react poorly to change; a poorly timed repotting, a pest infection or an unusually hot day can set them back for a couple of years. However, even plants that have been treated poorly can thrive, and if they are set back they often recover much stronger then they would otherwise be.

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 low to high elevations. Rainfall ranges from 10mm to 145mm per day, heaviest in June and lightest in January. Temperature ranges from 12C to 29C, highest in August (19C to 29C) and lowest in January (12C to 24C).

Fertiliser

Apply liquid based fertiliser per recommended directions. They can benefit from a high phosphate fertiliser leading up to flowering season, followed by a high nitrogen fertiliser when new growth appears, and a balanced fertiliser in other times. These orchids can also tolerate slow release fertiliser applied 1-2 pellets per cup (250ml) of media.

Use balanced fertiliser during Spring and Summer. Apply fertiliser regularly at half strength year round. Use a high Nitrogen fertiliser during Spring and Summer. Use a high Phosphorous fertiliser during Summer.

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,

Use water retentive media such as moss to prevent roots from drying out quickly This plant does well mounted to Cork slabs. Repotting is best done annually.