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Thread: Promoting multiple offshots?

  1. #1

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    Hi,

    as my plants do mature and start to climb, they normally do produce one single basal offshot. Exceptions from this rule were N. ventricosa, its hybrids and N. gracilis which did produce at least two. Other Nepenthes like N. fusca, N. carunculata, N. gymnamphora, N. talangensis, etc. do only produce one - and of course, I'd like to get more for experiments or trade. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]

    So, what are the reasons or factors for producing multiple offshots, do Nepenthes in the wild produce multiple offshots and will a Nepenthes immediately produce a new one after cutting of an existing one?

    Joachim

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    Joachim
    most of Nepenthes would produce multiple offshots after cutting.
    Few of them at nature produce multiple offshots when they reach some hight but others has no shots just one long stem.
    Arie
    Arie Cohen

    Israel Carnivorous Plants Society Chairman
    http://www.thecarnivorousplants.com

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    Joachim,

    I finally have permission from my wife to purchase a rather expensive little container of plant hormones called 'keiki' paste. This is used by orchid growers to promote 'keiki's, or 'baby plants'.

    I should have some by end of november, and will be experimenting on several plants. I will let all of you know how it turns out.
    \"Maybe in order to understand mankind, we have to look at the word itself: \"Mankind\". Basically, it\'s made up of two separate words - \"mank\" and \"ind\". What do these words mean ? It\'s a mystery, and that\'s why so is mankind.\" ~ Jack Handey

  4. #4
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Hi Joachim, the main reason Neps do offshots is to well live and thrive! [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] The one plant in the genus Nepenthes that is nortorious for this is N.Tobiaca regardless you cut it or not! [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] But after a cutting even slow growers like Lowii,Villosa would most likely produce a basal shoot eventually. [img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img]

    RamPuppy,I am interested in how all turns out in the KeiKi adventure. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] BTW, where are you buying it? (You can private messange me if need be. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] ) Thanks!

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    swords's Avatar
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    If you don't wish to actually "cut" your plant, try just sitting it on a wooden wedge or something so the vine tilts at the soil line and leans over -the farther the better it seems. Perhaps this prevents enough of the auxins from reaching the main growing point and tricks the plant into believing it's lost it's top?
    Both my khasiana x ventroicosa and alata x ventricosa sag quite hard to one side naturally due to several leaves on the opposite side not having made pitchers in the plants "youth" they produce a great many basal shoots! [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]
    In fact the khasiana x ventricosa produced about 5-6 basal shoots since I got it in June, of course they're small (tallest pitchers on the basal shoots is 2" while the parent vine makes 4 1/2-5" pitchers). Also, I kept these two rootbound through summer so that may have something to do with it as well...?

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    Tony Paroubek's Avatar
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    Close Swords, you got the concept right ;>

    Auxin is produced in rapidly growing meristem and young leaves/shoots. It promotes root growth and inhibits shoot growth. As it travels down the plant to the root system it inhibits lateral buds from initiating growth. Cytokinin produced in the roots travel up the plant and promote shoot growth. At some point as the vine grows taller, the effect of the cytokinin on dormant buds around the base of the plant will overcome the effect of the auxin and the lateral buds will break dormancy. Typically when you cut off the top the buds right below the cut will be the ones to break dormancy because the highest level of cytokinin is right at the cut point. I have also found that sometimes when more than one bud breaks dormancy the one lower down the stem will stop growing if a shoot above it noticably outgrows it. Probably an effect of auxin produced by the other new growing tip in halting growth in it's neighbor.

    Keiki paste works by artificially raising the cytokinin concentration at the dormant bud in an effort to break it's dormancy. Whether or not the bud will continue to develop after the keiki paste wears off remains to be seen.

    Bending the vine over or tilting the pot is an effective method as the auxin then settles in the lowest portion of the stem. This naturally works best on vines that are fairly long.

    There are also other things to consider. Some plants just naturally produce more side/basal shoots while others don't.
    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

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    my N. x Ventrata has one basal shoot, and another one coming. They are both coming from under the soil, not an axillary bud (or at least not one with leaves around it... It seems like its fromthe roots or something like that...). I was talking to Alan Bickell and he told me that if u can get the growth point below the level of the surface of the medium, it will produce an offshoot. Like Tony said, it's a more feasible practice with longer vines... My x Ventrata vine is about 30 cm tall, with a few more than twenty leaves, stading straight up, tied to a stake...

  8. #8

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    Hi,

    thanks for all your replies! Arie's comment on wild plants and Tony's remarks concerning his experience of plants with multiple offshots are most helpful. It matches my experience that even when multiple offshots do start to grow in first place, only one will survive and does get big.

    Bending over a plant won't help however, it'll still produce only one offshot due to the Auxin produced by this one. N. khasiana and N. mirabilis did also produce multiple offshots for me, so I would also put them to the group of "multiple offshot" Nepenthes. Keiki paste is not recommended from what I've found in German Orchid-forums, risk of loosing a plant seems to be very high.

    What I'm going to do is to cut off the offshot off, when big enough for rooting. The next offshot should emerge soon due to the drop in Auxin levels - following the arguments of Tony. It will be interesting to see if the cutting continues to grow as fast as if it would do still attached to the mother plant. (Basal offshots do only need four to seven leafes to reach the size of mature plants from my experience.)

    The logic behind Auxin and Cytokinin is also in line with my experiences with plants having two or more similar sized growth points. Those are extremely slow growing and only when one growth point takes over or the plant is divided they do really take up speed.

    Joachim

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