Dendrobium species care – Different care for different Dendrobium species

dendrobium

Dendrobium is Asian and Australian genus, and also dwells on many Pacific Ocean islands. Dendrobium orchids grow naturally in diverse ecosystems – from warm rainforests to cold Himalayan mounts and dry Australian deserts. Given the fact that they live in so different biomes, Dendrobium is one of the most diverse orchid genera and because of it they are divided into different groups, according to their specific demands. They are divided to cold, intermediate and warm-growing, and they can also be divided to ones who need a cold dry rest period, and ones who do not need it.

The orchids that vendors sold are actually complex hybrids and some of this complex hybrids do not actually require such cold and dry dormancy, as they have some warm-group Dendrobiums in their pedigree. hybrids are much more easy to grow than species Dendrobiums, and within species, the warm group is easiest to grow.

Dendrobium nobile, Dendrobium phalaenopsis, and Dendrobium bigibbum are three popularly grown Dendrobium species which have been used extensively in hybridizing. These species and their hybrids are often added to collections without the grower being aware of their very different cultural requirements. We hope that a knowledge of the climatic conditions in the three habitats will help growers decide whether they can provide the conditions needed to grow and bloom these species and many of their hybrids.

A few general facts about the large and varied genus Dendrobium might help growers understand the difficulty in trying to apply generalizations to so many species. D. nobile was once used extensively in hybridizing with 77 hybrids registered in which it was a parent. The most commonly used parents in recent registrations, however, have been the Australian species D. phalaenopsis and the closely related D. bigibbum.

Cold Dendrobium species

Cold-growing species are Dendrobium wattii, Dendrobium wangliangii, Dendrobium vonroemeri, Dendrobium vexillarius, Dendrobium vannouhuysii, Dendrobium sutepense, Dendrobium sulphureum, Dendrobium subclausum, Dendrobium stellar, Dendrobium sinominutiflorum, Dendrobium sculptum, Dendrobium rupestre, Dendrobium putnamii, Dendrobium piranha, Dendrobium otaguroanum, Dendrobium cuthbertsonii. They cannot tolerate warmth for long periods of time and need to grow at cool all year round, as they are mostly mountain miniature to medium-sized species. The best way to grow them is mounting on slabs because at cool conditions roots are very prone to rotting. Mounting is the best way to keep roots of these Dendrobiums healthy.

Intermediate-temperature species

The second group is intermediate growing Dendrobiums, such as Dendrobium kingianum, Dendrobium nobile, Dendrobium crassifolium, Dendrobium crassicaule, Dendrobium amethystoglossum, Dendrobium gnomus, Dendrobium harveyanum, Dendrobium loddigesii, Dendrobium longicornu. All of them prefer intermediate temperature, half to full sun and moderate watering. Some representatives of this group need cold and dry dormancy to develop flower buds. For instance, popular Dendrobium nobile, Dendrobium kingianum and Dendrobium loddigesii produce keikis instead of flowers if not provided with cool temperatures , but they prefer intermediate temperatures when they are vegetating.

Warm Dendrobiums species

The third group is so called warm Dendrobiums – well known Dendrobium phalaenopsis, Dendrobium speciosum, Dendrobium spectabile, Dendrobium tangerinum, Dendrobium taurinum, Dendrobium transparens, Dendrobium truncatum, Dendrobium unicum need warm grow conditions. Some of them such as Dendrobium phalaenopsis and spectacular Dendrobium spectabile need year-round hot to warm temperatures, but deciduous Dendrobium unicum needs cold and dry rest in winter but warm temperatures at summer. Most warm species normally grow in pots, but Dendrobium unicum suits better to be mounted on a slab.

source

https://www.lookingafterorchids.com/useful-articles/dendrobium-orchid-care-for-different-dendrobiums/
https://orchidculture.com/cod/free/Den_Art.html
http://www.aos.org/orchids/culture-sheets/dendrobium.aspx

Klairvoyant orchids

Coelogyne Rochussenii

coelogyne Rochussenii

Coelogyne (necklace orchids)

Coelogyne is a genus of over 200 sympodial epiphytes from the family Orchidaceae, distributed across India, China, Indonesia and the Fiji islands, The genus is abbreviated Coel in trade journals.
The wide distribution of this genus has resulted in a wide variety of temperature variation from species to species, some requiring cool to cold conditions to grow and bloom reliably, while others need decidedly warmer temperatures to achieve the same.

They have often a sweet scent, attracting different kinds of pollinators, such as bees, wasps and beetles.

A few species are commonly known as ‘necklace orchids’, because of their long, pendant, multi-flowered inflorescence.
Coelogynes could be divided to two big groups – so called “Cool” Coelogyne group and “Warm” Coelogyne group.
Cool Coelogynes:- come from mountain cloud forests of Himalayan, in nature they have warm but misty and cloudy summers and cool to cold but extremely sunny winters. Such Coelogynes such as large-flowered and extremely showy Coelogyne cristata, Coelogyne mooreana, Coelogyne mossiae, lovely Coelogyne fimbriata, Coelogyne nitida and Coelogyne corymbosa.
Warm Coelogyne group.:- They grow in much warmer biomes such as tropical rainforests, so they are more suitable for indoor growing because they do not need cold temperatures to grow and bloom. They are mostly epiphytes or lithophytes and occasionally terrestrials. Species such as Coelogyne speciosa, Coelogyne lawrenceana and Coelogyne salmonicolor with large single flowers, which have fancy lips need intermediate to warm temperatures, half shade to filtered bright light, moderate watering and fertilizers. Substrate should be epiphytic (medium bark) with some elements with high water capacity such as sphagnum moss. They have no definite dormancy period and simply need some reducing of watering after pseudobulbs had been formed.

coelogyne Rochussenii

Coelogyne rochussenii is a warm-growing, pendulous flowering orchid from low tropical areas of Singapore, Malaysia, Thailand and the Philippines.
It is really common in Singapore under cultivation and forms huge spectacular specimens with almost a curtain of pendulous spikes of flowers all around the pot.
Description

Plants bloom throughout the year with forty 6.25 cm wide flowers. Flowers can be fragrant with the scent of lemon.It’s grown for its handsome evergreen foliage and for its long draping clusters of fragrant, pale lemon-yellow blooms.Clusters of 20 to 40 buff-yellow blooms are borne on long dangling stems that sprout from the bases of old pseudobulbs in winter. Each blossom has five lance-shaped “petals” and a central creamy-white lip. The lip is marked with several yellow ridges and two brown bands.
Culture
Plants are usually grown in baskets. Plant grows in intermediate to warm temperatures with partial shade ( bright indirect or filtered light ).
Water regularly through the year. Pot in a well drain medium.
sources

1)http://orchids.wikia.com/wiki/Coelogyne_rochussenii
2)http://www.learn2grow.com/plants/coelogyne-rochusseni/
3) http://lkcnhm.nus.edu.sg/nis/bulletin2011/2011nis049-053.pdf
Video links

klairvoyant orchids