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Thread: Rafflesiana

  1. #1

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    I have a N. rafflesiana with spots in the top of the leaves. One leaf is almost red with them. Temps get just above 100F in my greenhouse, is that too much for the poor guy? I have a ventricosa in there and even it seems to be fine. Anyone have some advice?

    Thanks
    Dave
    Update: Parents convinced to allow me to keep greenhouse heated over winter. Most species will not be lost. Too lazy to update growlist.

  2. #2
    Nepenthes Specialist nepenthes gracilis's Avatar
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    Uh I would suggest keeping the temperature UNDER 100F Like 85F range. 100F is way too hot for most any plant (except cactus) but then again, if your humidity is around 80% or higher at 100F then I suppose it would be ok because transpiration rates coupled with the high humidity shouldn't be that bad too the plants. I would think form red spots it is sunburn.

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    Definatly too hot. Turn it down to 80-90 gradually of course. If it gets above 90 Neps do not grow too well.

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    Ok. But how does that explain how every other plant (even the ventricosa!) shows no abnormal behavior? No sunburn, good pitchering. Hmm...

    I've got a thermostat in the mail to me, so i should be able to control the temps better with that.
    Update: Parents convinced to allow me to keep greenhouse heated over winter. Most species will not be lost. Too lazy to update growlist.

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    Ventricosa is a tough plant with sturdy leafs. Being a highlander does not mean that it can not cope with hot daytime temperatures. It can get very hot on tropical mountains during noon.
    The red spots on your rafflesiana won't kill it - well, would have to see an image to be sure. The high temperature is definitely not needed, you can also save some energy.
    http://pitcher-plants.com/bannersmall.jpg Manila, Philippines, Elev: 80 m, 24-33 C

    Tropical outdoor growers: Please visit our Carnivorous Plants in the tropics forum

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    High temps do not cause leaf spotting based on our observations. rafflesiana, hookeriana, and a few others such as merrilliana will show the red spotting when the leaves are wet at night and the temperatures drop below 55 degrees F. This temp is an approximation-not hard and fast. Point is-we see it when the leaves are too cold at night, not so much caused by high day temperatures.
    Just thought of an exception. Water droplets on the leaves in full sun can cause little burn marks.

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    Most lowland Nepenthes will tolerate 100 deg. F OK for short periods if the RH is kept up. Certainly N. rafflesiana is one of these but it's not recommended, as Tre Bond says, 80-90 deg is much safer.

    High temperatures does not cause spotting on leaves by itself. Low temperatures does that, especially in association with water droplets as Trent says, or excessive light. If the temperature is too high for the plant , even if the humidity is high, then the first and last thing you will see is terminal loss of turgidity (wilting) from which recovery is not usually an option.
    Rob Cantley
    Nep Nut in Sri Lanka
    http://www.borneoexotics.com

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    The temps are around 70F minimum at night. I don't think that would be a problem though. I lowered daytime temps by opening up a flap. The highest temps got to 93F. My raff is already starting to perk up. [img]http://www.**********.com/iB_html/non-cgi/emoticons/new/smile.gif[/img]
    Update: Parents convinced to allow me to keep greenhouse heated over winter. Most species will not be lost. Too lazy to update growlist.

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