Propagation
Take tip cuttings from the shoot apex.

Remove offshoots that may root up successfully.
Tissue culture is used in commercial businesses.

Botanic information
Leaf: The leathery texture sessile leaves lanceolate to ovate and vary in colour from a mottled grey to mid-dark green.

Flower: The flower has an upright upper sepal,  2-spreading petals and 2-lateral sepals that unite to form a variable lip or pouch. They are solitary or are arranged in an upright raceme with 2 to 8 blooms and depending on the species they may appear either in spring or during autumn.

Fruit: They have a single chambered capsular fruit that contains many small seed with no endosperm. The small seeds are viable but the plant is commonly reproduced vegetatively, to maintain true to type. 

Culture
Water and Humidity
When watering do not allow the medium to be come soggy wet, allow the pot to dry a little before watering again. 
If the pot is placed in a saucer of water this will increase humidity and maintain moisture for the pot. Some soil mixes may become soggy so place some small stones under the pot to lift it out of the water.

Re-potting
When selecting a pot for the plant choose the correct size, not too large. 
The medium that is used should be well drained. When potting place styrene or bark in the base and then hold the plant in place filling in around it with bark or selected compost. Fill to the top of the pot level then sprinkle with selgrit (crushed limestone). Water thoroughly and allow to drain off. Be consistent with your potting mix for each occasion.