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Den. Gatton Sunray FCC/RHS and Den. Chrysotoxum

This is a discussion on Den. Gatton Sunray FCC/RHS and Den. Chrysotoxum within the General Orchid Culture forums, part of the Orchid Culture category; I have a Den. Gatton Sunray FCC/RHS and a Den. Chrsotoxum in my collection. I ...

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  1. #1
    ManilaByNight's Avatar
    ManilaByNight is offline Senior Member
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    Default Den. Gatton Sunray FCC/RHS and Den. Chrysotoxum

    I have a Den. Gatton Sunray FCC/RHS and a Den. Chrsotoxum in my collection. I got these plants when they were about a 6 inches tall with three canes each. They had flowers that time. They are now around three years old with me and they have really grown HUGE as in three feet tall with numerous, healthy canes!

    They are very robust growers and very healthy. The canes are solid and plump and the roots are very, very healthy and profuse. In fact, I've recently repotted the root-balled mass of orchids into bigger containers since they were beginning to get pot-bound. My only problem is that they have never flowered since I first acquired them. I've been faithful in my fertilizing and have even applied bloom booster fertilizer to try and coax them to flower but no success. They just keep growing fatter and taller so I'm not really worried about their health. All the leaves are intact.

    Could it be the temperature requirements of these particular plants or maybe something else? They get a lot of bright light throughout the year. Hmmmm .... at least they're growing very well but flowering is a different story altogether.

    I saw a Gatton sunray in the nursery of a friend and it was definitely bigger than what I have - almost 5-6 feet tall and had a single spray of numerous, huge, bright yellow flowers. So very, very pretty. Is this really a finicky plant to bloom? Or is Manila temperature simply too hot for these to flower?

  2. #2
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    Usually when orchids grow and grow but never flower its usually because they are not getting enough light. You should try increasing the light and maybe that will fix your problem or it could be that they need a winter rest which they are probably not getting which is why they are not flowering.

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    Jojo, I am sure Your Manila temperature is perfect for Den Gatton Sunray.Mine blooms at least twice a year. It needs plenty of light, even to full sunlight. If yours is the FCC RHS clone then it must be the var Excelsior. Though the flower is short-lived it is one of the most spectacular dendrobes there is.Can anything come close to that fantastic substance?

    Unfortunately Den chrysotoxum is a different kettle of fish culture-wise.Though it needs plenty of light, it also needs a prolonged dry season with lower temperatures(around December to March - i.e. a dry, cool winter) like its home in Northern Thailand. If you can replicate that then you might be able to bloom it.In 12 years I have seen it bloom only once here in a friend's collection.

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    Quote Originally Posted by Raver View Post
    Usually when orchids grow and grow but never flower its usually because they are not getting enough light. You should try increasing the light and maybe that will fix your problem or it could be that they need a winter rest which they are probably not getting which is why they are not flowering.
    I don't think light is the problem as it is getting lots of it. The plants are hanging in my third floor balcony which doubles as my laundry area so plenty of humidity and very bright light in that area. There is clear polycarbonate roofing to protect us and our laundry hanging to dry from any sudden, heavy downpour.

    Could be the winter rest though .... but the plants seem to be actively growing all year round. Hmmmm ..... ????

    Thanks for your ideas.

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    You should try posting some pictures of your plants

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    Quote Originally Posted by catttan View Post
    Jojo, I am sure Your Manila temperature is perfect for Den Gatton Sunray.Mine blooms at least twice a year. It needs plenty of light, even to full sunlight. If yours is the FCC RHS clone then it must be the var Excelsior. Though the flower is short-lived it is one of the most spectacular dendrobes there is.Can anything come close to that fantastic substance?

    Unfortunately Den chrysotoxum is a different kettle of fish culture-wise.Though it needs plenty of light, it also needs a prolonged dry season with lower temperatures(around December to March - i.e. a dry, cool winter) like its home in Northern Thailand. If you can replicate that then you might be able to bloom it.In 12 years I have seen it bloom only once here in a friend's collection.
    Thanks Yew for your ideas. Yes it is the FCC/RHS clone and I do recall it has the most spectacular and HUGE flowers ... just like in the old contest and show photos I see on the web and some of the old AOS magazines. The chrysotoxum is doing well (vegetatively) as I have mentioned that it has grown humungous but no flowers .... Yes perhaps it has something to do with cool weather like you mentioned. Too bad it's not that cool here in Manila ..... well, at least it's growing well and robustly .... could be worse with some cool-growing dendrobes I've had in the past where year after year, the growth gets smaller and smaller until POOF! It's dead

    Just like an old saying I've heard from some of my seasoned orchid grower-friends .... You'll be able to grow that here but flowering is an entirely different story altogether. Awww shucks!

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    Actually both are intermediate grower. The key to blooming both of them is 'DRY REST' and 'HIGH LIGHT' especially in winter. I grow both chrysotoxum and pulchellum (Gatton Sunray's parent) on south windowsill, no water from Oct till March (i water when the canes start to shivel), night temp around 14-15'C and they bloom like clock wise.

    I don't feed alot, especially to pulchellum coz i don't want the cane to be longer than already is, now about 2 feet.

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    After reading your blog Jojo, I went and checked my little Den. gatton sunray and found two little flower spikes at the ends of two old leafless canes which I assume are 2008 growths.

    I was given my plant about a year ago and it is a division. It has one small cane with leaves from last year.

    I grow under 70% shade cloth in the subtropics and my plant gets the same treatment as my other orchids, except for the soft cane Dens. - weekly/weakly feeds.

    Not sure if the above will help or confuse you.

    Scrubber

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    Our Den. gatton sunray was placed in direct sunlight in Quezon City and it has given us blooms for 2 years now.

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    Quote Originally Posted by phil View Post
    Our Den. gatton sunray was placed in direct sunlight in Quezon City and it has given us blooms for 2 years now.
    Hmmm .... my plant is getting bigger. Good growth with plenty of roots and light but no flowers yet till now. I've just stopped worrying about it and just let it be to grow to its delight. Who knows it may just trigger itself into flowering one day....

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