Sobralia dichotoma

Also known as: The Two Piece Sobralia or Sobralia mandonii f. coerulea Sobralia mandonii Cattleya tichotoma in the subfamily: Epidendroideae

Native to: Amazonas - Colombia Amazonas - Peru Cusco - Peru Departamento de Tolima - Colombia Departamento del Huila - Colombia Ecuador Region de Huanuco - Peru

General Information

The Two Piece Sobralia is a giant cool to warm growing terrestrial orchid belonging to the sub family Epidendroideae native to Colombia, Peru and Ecuador.

Plant Description

Grows to 600cm. Each new growth has numerous thick lance shaped, oblong shaped leaves that grow to 3.8-38cm long. Pseudobulbs grow to 28-600cm. The plant forms clusters over time

Flowers

Numerous fragrant blossoms appear

Fragrance

The orchid is fragrant.

Substrate(s)

• Coarse
• Bark
• Charcoal
• Treefern
• Spaghnum Moss
• Perlite
• Sand

Care Notes

These orchids grow on the forest floor so are used to rich soil containing plenty of organic matter that is always moist (but not always wet), and prefer constant conditions in terms of humidity, temperature and water supply. They may not be as forgiving as epiphytes in regards to sudden changes in growing conditions so it is wise to ease them into new conditions over a the space of a few days, and repot as infrequently as possible.

Keep an eye on the plants condition regularly as they can decline suddenly if the conditions are not just right. It is more important to keep water supply constant rather than frequent - overwatering often causes rot which can quickly set in, especially in warmer conditions.

These can be grown in shady, moist areas in the garden, supplied they have protection from abrupt changes caused by the elements, e.g. dry winds, frost etc. Being grown around companion plants such as ferns and bromeliads will help build and retain the humidity they require throughout the year.

Fragrant:

• IsFragrant

Climate

Grows at low to high elevations. Rainfall ranges from 5mm to 163mm per day, heaviest in July and lightest in January. Humidity ranges from 57% to 78%, highest in August and lowest in January. Temperature ranges from 7C to 30C, highest in May (14C to 30C) and lowest in January (7C to 27C).

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.

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. Reduce fertiliser when plant is dormant during Spring.

Potting

These plants can be sensitive to repotting though should not require repotting regularly. Repotting should be done when the mix has broken down to the point that it doesn't absorb water or holds onto water for far too long, usually the plant shows a decline in growth as well.

The mix should be free draining, with a blend of 30% inorganic ingredients such as coarse sand, gravel or perlite, mixed in with about 70% organic ingredients such as peat, leaf litter or decomposed bark. Avoid commercial potting mixes as they can vary wildly and may contain "wetting agents" that can hold onto water for loo long, causing rotting and stunted growth.

Repotting is best done annually and in a pot the same size or only slightly larger than the previous one.