Dendrobium johnsoniae is native to Papua and New Guinea. In Papua, these orchids grow along the northern coast from the border with Irian Jaya to the eastern end of the island. They usually grow in very bright positions, often in full sun.
Dendrobium johnsoniae, also called as Johnson's Dendrobium, Dendrobium macfarlanei, Dendrobium monodon, Dendrobium niveum, Latourorchis johnsoniae, Sayeria johnsoniae, is a species of the genus Dendrobium. This species was described by Ferdinand von Mueller in 1882.
IDENTIFY DENDROBIUM JOHNSONIAE
Dendrobium johnsoniae is native to Papua and New Guinea. In Papua, these orchids grow along the northern coast from the border with Irian Jaya to the eastern end of the island. They usually grow in very bright positions, often in full sun. They are often found in Casuarina trees growing along watercourses and gullies at heights of 500 - 1200 m. On Guadalcanal, they grow on Calophyllum trees near the peak of Mt.Austen at an altitude of approximatively 530 m.
It is a small to medium sized, warm to cool growing epiphyte, which reaching 20-40 cm in height, with narrowly fusiform, to 9 noded, purple brown or green, 13-30 cm long stems carrying to 4, suberect, ovate, mostly concave of up side, coriaceous, slightly unequally bilobed apically, 8-10 cm long leaves.
Johnson's Dendrobium blooms most often in the fall and winter but a secondary bloom is possible at any time of the year, on a 12" (30 cm) long, axillary, erect, several to 10 flowered, racemose inflorescence with fragrant flowers arising from the nodes near the apex of both newly leafed and leafless canes. The flowers are 6.5-12.5 cm in diameter and are completely open. The inner whorls, wavy along the edges, are wider and longer than the petals of the outer whorl. The pointed petals of both whorls are white and glisten in the light. The violin-shaped lug has purple stripes in the throat and on the side plots.
DENDROBIUM JOHNSONIAE CARE AND CULTURE
Cultural information should only be used as a guide, and should be to be adapted to suit you. Your physical location; where you grow your plants, how much time you have to devote to their care, and many other factors, will need to be taken into account. Only then can you decide on the cultural methods that best suit you and your plants.
Light:
Dendrobium johnsoniae needs a light level of 30000 - 40000 lux.
Temperature:
It is a thermophilic plant. Throughout the year, the average daytime temperature is 23-26 ° C, at night 16-18 ° C, which gives a daily difference of 6-9 ° C.
Humidity:
Johnson's Dendrobium needs the average humidity of 85-90% throughout the year.
Substrate, growing media and repotting:
Dendrobium johnsoniae can grow in pots with a substrate that will keep the moisture, but will be airy. The roots should never be soaked. Their roots grow on the surface, so they are very sensitive to excess moisture, therefore it is recommended to use small pots with many holes, slightly larger than the root ball. Repotting is best done when new roots emerge.
Watering:
Precipitation is very abundant for most of the year, with some reduction over a 3 to 4 winter months. The plants should always be moist, with little drying between watering. In hot weather they may need watering at least once a day.
Fertilizer:
This plants should be fertilized every week with 1/2 of the recommended dose of fertilizer for orchids. The balanced fertilizer should be applied weekly or every 2 weeks throughout the year.
Rest period:
In winter, it is necessary to reduce the amount of water and fertilizers of the plants grown in the conditions of a short, dark day. However, they should never completely dry out.
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