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Thread: how to get gemmae?

  1. #9
    白人看不懂 Drosera36's Avatar
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    I only grow three species: D. scorpioides, D. paleacea ssp. paleacea and D. pulchella. The D. scorpioides and D. paleacea produced gemmae for me when I did this, and it looks like my D. paleacea are starting to do it again this year.

    I figure that if you make the photo-period change gradual (as it would be in nature), then the plants are more likely to produce gemmae. I tend to reduce it in half-hour intervals, alternating between the turning-on and turning off times.

    i.e., If it currently turns on at 7:30am and turns off at like 8:30pm, I'd switch the turn-on time to a half-hour later to 8:00am, and then around 2 weeks later, I'd switch the turn off time from 8:30pm to 8:00pm. This, I think, just makes it easier on the plants.

    Decreases in temperature may also help.

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    mcantrell's Avatar
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    I should invest in a timer for my plants, but man, they're hard to find locally. Hopefully Target will get some in due to all the holiday decorations. Maybe I just shouldn't worry too much about it for right now.

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    I produced gemmae from d. pulchella and nitidula x ericksoniae by decreasing the photo period by one hour every week from a thirteen hour period to eight 1/2 hour period. Gemmae were produced about... two weeks after 8 1/2 hour photo period was reached? Cant... re...member... Its been a while. All plants are grown under lights, with no temperature fluctuations. Average temperature is 72 degrees Fahrenheit.
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    It's been one of dem days BigCarnivourKid's Avatar
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    Getting them to quit producing gemmae has always been my problem. They grow outside during the summer and in a south window during the winter. I always get a ton of gemmae, though they were a little late starting up this year. I don't give them any supplemental light at all. Just water them when the trays dry out.
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    Tropical Fish Enthusiast jimscott's Avatar
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    Quote Originally Posted by BigCarnivourKid View Post
    Getting them to quit producing gemmae has always been my problem. They grow outside during the summer and in a south window during the winter. I always get a ton of gemmae, though they were a little late starting up this year. I don't give them any supplemental light at all. Just water them when the trays dry out.
    I don't know why but scorpioides (and dichrosepala) struggle every summer. All the nitidulas, Lake whatever, and the others come through just fine. How deep are your pots and do you only add water when the tray is dry?

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    alec's Avatar
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    Mine sits in water all the time and its a small pot. is this okay?

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    mcantrell's Avatar
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    Quote Originally Posted by alec View Post
    Mine sits in water all the time and its a small pot. is this okay?
    I am no expert, but I have had a LOT better luck with frequent smaller waterings than soaking up through the tray.

    It may be that I just get overzealous and don't let the tray dry out -- you do want to let it dry out between waterings, otherwise you can rot the plant's roots and the bottommost soil. You can tell if this is going on if you take the pot out of the water and the bottom of the pot stinks.

    Anyway, yeah, make sure you let the tray dry out a little bit before each watering.

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    I grew most of the species in my time. In general, cooler temps, photoperiod 10-11 hrs light cycle, wet but not sodden and I strongly suspect any interruption of the dark period may inhibit gemmae production. If all else fails be sure your plants are utterly in the dark. One grower I know had success after blocking off light from a streetlamp. Hope this helps. Do a websearch: Ezine Growing pygmy Drosera for my set up.
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