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Bifoliate cattleyas - some of the second leaves are limp.

This is a discussion on Bifoliate cattleyas - some of the second leaves are limp. within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; John, I've got the same problem. I grow outdoors under 70% shade cloth in summer ...

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  1. #11
    ischel1's Avatar
    ischel1 is offline Senior Member
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    John, I've got the same problem. I grow outdoors under 70% shade cloth in summer and indoors under lights in winter. I use Orchid plus 20-14-13 alternating with Bloom Booster 11-35-15 year round. Thought it was just me with the floppy leaves. Thanks for posting this, it makes me feel better!

  2. #12
    wetfeet101b's Avatar
    wetfeet101b is offline It's not dead! It's just permanently dormant.
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    Thanks everyone for your suggestions.

    I will try the lower nitrogen ratio during the next growing season and see if they get better results.

  3. #13
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    I also think it is caused from the nitrogen level growth that is to fast , I get it off and on from the bifoliate Catts. also get the single leaf thing . Gin

  4. #14
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    clintdawley is offline Wrapped in metal..wrapped in ivy...
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    Default Temp??

    Can I go out on a limb here and say temperature?

    I've noticed this on some plants that I once grew outside in the summer but now reside on a much cooler but still brightly lit windowsill...

    In the summer the grow that was produced in 95-105 degree day highs was tall and spindly, not the short compact and firm growth that I was used to. I also think that high night temperatures (it never gets below 72 here from June - September) cause this week and 'leggy' growth.

    How are your night temps in Riverside? I know that your daytime temps are almost as hot as here (especially in your greenhouse).

  5. #15
    wetfeet101b's Avatar
    wetfeet101b is offline It's not dead! It's just permanently dormant.
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    Temperature could also be a factor. I am not ruling it out.
    However, this only appears to happen on 3 plants. I have 5 C. Hawaiian Wedding Song plants and only two of them exhibit this problem (plus another Lc). The rest that are growing in the same area do not seem to go "limp". Very puzzling.

    Riverside diurnal during the summer is a bit extreme.
    We could have 100F during the day and it could be 65F with fog at night.
    It is hot and dry when the sun is up. But as soon as the sun sets, it feels like the entire city is relocated to Oregon.

    And we were unusually cooler this year (not that I am complaining )

    During the cattleya growing season this year (April through July and onwards, these are the typical temperatures inside and outside the GH.

    April: 80F/45F outside : 72F/55F inside * (heater running at night)
    May: 88F/50F outside : 80F/55F inside* (heater running at night)
    June: 98F/58F outside : 90F/62F inside.**
    July: 99F/64F outside : 92F/66F inside. (still mid July so it could get warmer)

    ** We did get a heatwave late June where the daytime temps reached 107F outside and 75F at night for almost a whole week.
    I was watering almost every two days during that week because the baskets dried out within a day.
    It is possible that this short burst of heat has caught some of these second leaves right at a critical point in their growth.
    That could explain why some leaves are fine while the others are ok.

    We are still bracing for the warmer months in August and September.
    However, I think the above four months are the ones that are significant for the cattleyas in my greenhouse.

    I admit my daytime temperatures in summer is still too high, but thats the best I could do without installing an industrial grade cooling unit. My plants are mostly warm growers anyway.

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