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growth nodes per pbulb

This is a discussion on growth nodes per pbulb within the General Orchid Culture forums, part of the Orchid Culture category; Anyone care to share thoughts about what they may have seen or read regarding the ...

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  1. #1
    peteMc's Avatar
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    Default growth nodes per pbulb

    Anyone care to share thoughts about what they may have seen or read regarding the number of growths - pbulb growths - possible from a mature pbulb? I have read that there are usually two, and am wondering if this is how it is for all orchids in general or if there are exceptions to this.

    thanks.
    p

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    I had a Milt that produced 3 new growth but 1 has stayed small.
    Normally i,d say 2 is the most likely but i only grow a small selection & there are probably species that produce muliple PB,s per mature PB.
    Any particular species in mind ?

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    this is a hybrid weirdo, a Coryhopea - Stan tigrina x Coryanthes macrantha - that has been growing like a weed here since June or so. barely more than a seedling when it arrived, it has put out three mature-sized pbulbs. the first put out two, which was nice to see but did not warrant any special attention. these two, whose bracts haven't even browned yet, have a total of five new buds.

    an interesting thing, if you're into Stanhopeinae, is the pattern to the number of leaves per bulb on this one. So far, it has alternated from the Coryanthes two per bulb, to the Stan's one per bulb, on each new growth.

    [ok, maybe i'm spending a bit too much time with them, but it beats shoveling snow all day]
    p

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    I have an Oncidium intergenerics that has 4 growths in one of its pbs. They are only over 1 inch tall now but all of them are growing vigorously. I have a Grammatophyllum elegans in sphag and bag that is showing 3 nodes in one pb, and when I peeled off the protective sheath of the rhizome I saw others, smaller ones, I call them reserve growths. I also have Dendrochillum (sp??) backbulbs that have developed nodes even though both the 2 leading nodes have died. I have Bulbo dearei backbulbs that I have yet to find out if it has reserve "eye" or nodes because the leading nodes are dead.

    What I think is some orchids don't have reserve nodes, one example is Psychopsis, ( I think). While some others have multiple reserve growths in store in case the leading one dies. I have only seen one growth developed fully at a time. If the four growths of the Oncidium will all develop to full maturity, it will be my first observation. But I have a very small collection and very limited experience,I would love to hear also what others have obeserved about their plants.

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    Tanya, four new growths off of one PB is great: the most I think I've ever had come up at one time was three, and Pete, you're right, two is the typical number. That alternation in your Coryhopea is pretty cool too--I wonder if the flowers that come up on the cory bulbs will look any different than the ones from the stan bulbs. Would be something if they did!

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    The most I have ever had is three, which I find odd. I'm sure 2 is typical though.

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    umm, I have a two year old paph insigne and paph fairieanum and they both have three new growths from the initial first growth. The thing is my fairieanum has lost two leaves at once, so I guess having loads of new growths must be taking it's toll on the plant. oh and yes I know... these don't have p/b but I figure, new growths are new growths right... now those two plants are regarded as easy to cultivate so I guess it depends on the plants... ie some people say with regards to the paph philippinense complex that var. laevigatum tends to be more prolific in terms of growths (of course some won't even accept the taxonomic difference so back to square one).. umm what was I saying again... hope I haven't confused anyone

    cheers
    tim

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    thanks all...

    I am wondering what will be dominant in the flowers as well. I have seen pics of blossoms of this cross from other parent plants, and they seem to lean a bit more to the Cory side, maintaining the helmet and bucket structure but the bucket generally opened out a bit. Never occured to me that the producing pbulb might have anything to do with it, but i will be keeping an eye on it, definitely.

    OK, i'll fess up. I was hoping - against the season and light conditions - that one of these growths was a spike. they all appear to be pbulbs, which, believe me, is no disappointment at all.

    thanks again
    p

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