Dendrobium horstii

Also known as: Grastidium exaltatum Dendrobium exaltatum in the subfamily: Epidendroideae

General Information

Dendrobium horstii is a sympodial orchid belonging to the sub family Epidendroideae.

Plant Description

Sympodial. Grows to 69cm. Each new growth has numerous lance shaped leaves that grow to 14cm long. Pseudobulbs grow to 69cm. The plant tends to climb or sprawl with each new growth

Substrate(s)

• Coarse
• Bark

Climate

Grows at low elevations. Rainfall ranges from 292mm to 442mm per day, heaviest in September and lightest in January. Temperature ranges from 21C to 32C, highest in May (23C to 32C) and lowest in February (21C to 28C).

Watering

These orchids prefer a constant supply of moisture, with a slight drying out between waterings. Saucers can be placed under pots to retain moisture during hot weather, however the saucers should be removed or let to dry every 1-2 weeks to prevent rot. Keep an eye on the plant especially in hot weather and look for cues of under/overwatering and adjust accordingly.

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 year round. Apply fertiliser regularly at half strength year round.