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Old 11-18-2006, 05:28 PM
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Potting medium

I've got some pearlite and a bag of coconut mulch, and I would like to repot three plants. How do I prepare the potting medium. What ratio of coconut mulch and pearlite should I use? What's this about having to soak the mulch?

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Matt
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Old 11-18-2006, 07:12 PM
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I believe the situation with the coconut mulch is that coconuts have a lot of salt because of where they grow (by the sea). I use coconut coir with my phals and have rinsed it off several times really good in a colandar and then mixed with about 20% perlite and 5% charcoal (very rough estimates) - so far they seem to love it! :-) Good luck! mike
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Old 11-19-2006, 09:29 AM
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You definitely need to rinse it, get as much salt out as possible, and rinse it again. I have seen people rinse it 5 or more times to get the salt out. Salt will be fatal if allowed to remain in that orchids are very sensitive to it.
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Old 11-19-2006, 01:21 PM
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My mix is 3 parts small perlite to 2 parts coconut coir or Canadian peat, and I use it on just about everything. Seems the smaller the perlite, the more you need. I used fine perlite (by sifting), and the mix was not a success. You might include a soak cycle in the rinsing of the mulch/coir.
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