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Fertilizing plants in semi-hydro

This is a discussion on Fertilizing plants in semi-hydro within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; I decided to give semi-hydro a try with one of my phals and one of ...

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  1. #1
    dougroc is offline Senior Member
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    Default Fertilizing plants in semi-hydro

    I decided to give semi-hydro a try with one of my phals and one of my paphs. I went to the hydroponic store and got their smallest bag of hydroton. (Going to the hydroponic store is an interesting experience, I was amazed at how many scruffy young men with lots of tattoos are into growing "tomatoes" in their basements)

    Anyway, my question is this: Do I use the same concentration of fertilizer on my semi-hydro plants as I do the one in fir bark? Also, do semi-hydro plants require flushing with plain water as do the fir bark guys?
    Last edited by dougroc; August 22nd, 2009 at 02:44 PM. Reason: grammar error

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    Halloamey is offline Senior Member
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    Quote Originally Posted by dougroc View Post
    I decide give semi-hydro a try with one of my phals and one of my paphs. I went to the hydroponic store and got their smallest bag of hydroton. (Going to the hydroponic store is an interesting experience, I was amazed at how many scruffy young men with lots of tattoos are into growing "tomatoes" in their basements)

    Anyway, my question is this: Do I use the same concentration of fertilizer on my semi-hydro plants as I do the one in fir bark? Also, do semi-hydro plants require flushing with plain water as do the fir bark guys?
    I don't think those guys are into growing "tomatoes". I had been to one such hydroponic store which had some cool looking lighting equipment, carnivorus plants and orchids in the showcase windows, but as soon as I entered inside, I realized it had most of the stuff to grow marijuana, I fled the place as if I had seen a ghost hehee.
    As to your question for my plants in semi hydro I reduce the quantity of fertilizer to almost half. For my orchids in bark mix I fertilise with 200 ppm of NPK, but for my orchids in SH I fertilize only 125 ppm of each NPK. Also flushing every two weeks with plain water is essential to prevent fertilizer build up.

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    I've been using time release fertilizer pellots at a rate of 1/4 teaspoon per pot for the three months the pellots supposedly last. Flushing every couple of weeks (or rather soaking the pot and plant in a larger container of water so the clay pellots get a chance to absorb water) is a good practise.

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    dougroc is offline Senior Member
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    Thanks for your help, guys. As to the flushing to prevent the buildup of salts, I tried a variation on semi-hydro on one of the plants (not sure where I saw it, could have been here).

    With this technique, you have holes in the bottom of the pot, but the main pot sits inside a shallow tub of water filled to the level of the holes in the side of the primary pot. In this manner the water in the tub can be changed on a regular basis to prevent buildup.
    Last edited by dougroc; August 23rd, 2009 at 07:23 PM. Reason: goofed

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