Oncidium sphacelatum

Also known as: The Burnt Spot Oncidium or Oncidium sphacelatum h.f. flavum Oncidium stenostalix Oncidium sphacelatum f. xanthinum Oncidium schrautianum Oncidium sphacelatum var. majus Oncidium sphacelatum var. minus in the subfamily: Epidendroideae

Native to: Belize Guatemala Honduras Mexico

General Information

The Burnt Spot Oncidium is a giant sympodial cool to warm growing epiphytic or lithophytic orchid belonging to the sub family Epidendroideae native to Belize, Guatemala, Honduras, and Mexico.

Plant Description

Sympodial. Grows to 50-75cm. Each new growth has numerous erect rigid leaves that grow to 2-60cm long. Pseudobulbs grow to 2.5-18cm

Flowers

Numerous fragrant blossoms appear

Fragrance

The orchid is fragrant.

Substrate(s)

• Coarse
• Medium
• Bark
• Charcoal
• Spaghnum Moss
• Perlite

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.

Fragrant:

• IsFragrant

Climate

Grows at low to high elevations. Rainfall ranges from 38mm to 508mm per day, heaviest in September and lightest in March. Humidity ranges from 82% to 90%, highest in January and lowest in April. Temperature ranges from 16C to 28C, highest in May (20C to 28C) and lowest in January (16C to 21C).

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.

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

Due to the growth nature of these plants they are best mounted onto cork, tree fern slabs, or even trees if the climate suits. Water regularly especially in hot weather.

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