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Thread: Drosera Rotundifolia-SDCPs's research thread

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    SDCPs's Avatar
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    Post Drosera Rotundifolia-SDCPs's research thread

    I have learned a great bit from reading the sections of Darwin's Insectivorous plants available in e-book format here: e-book
    or here: Original book in PDF with Illustrations
    ICPS on growing from seed: Germination Guide
    Pictures: Rotundifolia Humbolt Co. is Big Lagoon!

    IMHO you should read the e-book then look at the pictures in the original book if you're interested.

    Lets get started! Rotundifolia are coming out of dormancy in San Diego! The plants I have available are from Big Lagoon and Butterfly Valley CA. I am interested in using these plants because they are native to the CA coast, so I'll be able to know how to cultivate a plant native to my state. They weren't easy to get!

    Drosera Rotundifolia, or the common sundew, is found nearly everywhere except Antarctica. It is small, ranging from 13cm to 3 cm with 6cm being about typical to the U.S. In nature, it grows in beds of sphagnum moss. I will be test-growing some in peat and sand. In fact, I germinated 1 seedling with the media...but fungus gnats got to the pot so that may be why most haven't grown. If you want to sow rotundifolia seed, I recommend that you stratify it in the fridge with some moist LFSM for four-six weeks. Then, spread the LFSM on a pot full of moist peat and place it in a bag. Put this under lights and they should start growing. Even better, sow on your bog or on a pot outside in the fall. There will be plants for you in the spring.

    The tentacles and leaf close around prey slowly, even slower than d. capensis. I placed a fly on a leaf of one emerging from dormancy, and it took a full day for infliction to occur...probably due in part to the fly being just recently killed, the cold temperatures, and the state of the plant. The tentacles are solidly built, with long ones extending from the base of the leaf. According to Darwin, they become inflicted if something (anything) touches the surface of one of the glands [on the tentacle] even if it is 1/1000th of an ounce. Please note that only a single tentacle would be inflicted with a substance this fine. He was puzzled why dust and debris left tentacles unaffected. Of course, matter with nitrogen or nitrogenous matter caused much more movement. That is why flies and blood worms excite drosera so. Darwin observed infliction in under 10 minutes with highly excited young leaves.

    Drosera routdifolia is a small plant. The biggest seen have been under 6 inches in diameter. Most of that is petiole. Even though they are typically about as big as a half-dollar, the dew is really sticky! Maybe it is the design of the leaf. Compared to d. capensis, I think d. rotundifolia dew is more powerful. One thing interesting to note is that d. rotundifolia always brings its prey into the center of the leaf while feeding. The exterior tentacles always inflict inward--in fact, all the tentacles inflict inward toward the center. the prey is brought toward the center by this movement. Once the prey is in the center of the leaf, the leaf forms a cup to hold the juices.

    Here are the plants I will be using. They are just waking up:

    From Big Lagoon:



    From Butterfly Valley:



    with the fly I discussed earlier:



    This thread is brought to you by Not a Number, who asked me to read up on rotundifolia and share my findings. He also donated seed from a small California population for the research. It is also brought to you by Flytraplady(5?) who sent me the plants that are coming out dormancy now (in a trade).


    To Be Continued as I experiment!

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    Tropical Fish Enthusiast jimscott's Avatar
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    It's an under-appreciated plant for sure!

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    clippity-clip-clip Clue's Avatar
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    If you ever have any extras...

    So what experiments will you be doing with them?
    "I, for one, can't wait to grow Nepenthes extincta!"
    Plant List ; blog

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    Hello, I must be going... Not a Number's Avatar
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    Well my "Big Lagoon" seed batch germinated and are just putting out their first trap leaves. I sowed way too many but in my experience D. rotundifolia seedlings have a high mortality rate. Perhaps if I can get them up to a decent size in time for the NASC auction there may be some available.
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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    SDCPs's Avatar
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    NaN, if you have too many...I want to put rotundifolia in every pot with the sarracenia!...and fill my bog with it.

    (and I don't have enough! )

    Anyway,

    Clue, I will experiment with different things such as how fast rotundifolia starts digesting prey, how efficient it is at trapping larger bugs (or do they get away?), if they thrive in medium other than sphagnum and more when I think of things to test.

    I will keep updating the first thread as you may notice so keep checking back!

    ---------- Post added at 05:46 PM ---------- Previous post was at 05:45 PM ----------

    and if you want me to try something...or want to add your input about rotundifolia, just PM me or post here.

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    Hello, I must be going... Not a Number's Avatar
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    I sent your more seed than I have sown, and besides you have a mature plant that might set seed this year. There's pleasure to be had in growing your own which will be acclimated by default to your growing conditions.

    The NASC auction has priority in my book.
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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    SDCPs's Avatar
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    Smile

    Quote Originally Posted by Not a Number View Post
    I sent your more seed than I have sown.
    Wow! Thank you very, very much. When you said you had too many plants...I usually think of a whole tray filled with plantlets. Sorry for the misunderstanding.

    The NASC auction has priority in my book.
    But of course!

    Anyway, I will be updating the original thread so we can see if the big lagoon and butterfly look any different. If you have any ideas NaN, I would like to know about them so PM me. Thanks for the idea and the seed!

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    Hello, I must be going... Not a Number's Avatar
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    FYI - some of Ivan's D. rotundifolia, still with winter buds:
    Pots are 2.5" (63.5mm)

    Big Lagoon




    Grass Lake

    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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