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Old 05-07-2018, 11:21 PM #1
samiam
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Root rot prevention in rockwool?

What are you guys using in Rockwool to prevent root rot?

It seems pots of rw get really water logged in the bottom of the pot. Even with a layer perlite in the bottom.
Like the top drys out way to fast, and still soggy on the bottom.
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Old 07-17-2018, 02:56 AM #2
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Try watering less amount of water so it only saturates top layer. For example if you water 500 ml at a time and u see the the entire rockwool get wet cut it in half or even more so only top gets saturated and it gives the bottom of rw time to dry out.
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Old 07-17-2018, 06:55 AM #3
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Never let it dry completely out, it should always at least be a tiny bit moist before the next flooding. This keeps the pH from crashing and the nutrient strength from spiking, both which will cause root rot.


Keep the rockwool less than 75F? Not sure, but I believe there's a max temp rockwool can handle before heat related root damage begins.



Keep your feed low. The more floodings you have each day, the lower the nutrient strength should be.
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Old 07-17-2018, 02:21 PM #4
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Had the same issue using rockwool croutons in flood and drain once. Have to keep root temp lower and let rockwool dry out more (water less often). I found the reservoir temp stayed <72 yet the rockwool, which was much closer to the lights, got much warmer. I was unable to lower the room temps, to keep the root temps lower, so I stopped using rockwool and switched to Hydroton.

You can also try a layer of Hydroton under the rockwool instead of perlite. May help drain better.
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Old 07-30-2018, 10:06 PM #5
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You shouldn't be getting root rot in Rockwool. Could be a temp issue within the room. Environmental controls is key to a successful and bountiful harvest. Also..they could be too close to the lights.
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Old 08-01-2018, 04:38 PM #6
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do not use rockwool.
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Old 08-11-2018, 08:09 PM #7
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I had major root rot in my last two runs. I'm thinking its from watering the rw with warmer water. Now the temp is always under 76f. I haven't had a problem since.
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Old 08-11-2018, 10:02 PM #8
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I tried rockwool once and initially I thought it would work well.
But then I had moisture issues also and went back to soil.
Soil is so much easier on the brain than rockwool.
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Old 08-12-2018, 02:41 PM #9
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root it cubes are much better than rockwool. They don't affect the ph, or saturate like rockwool.
I wouldn't waste my time with rockwool, germ in a root it cube, then straight into hydroton- that's what you want.
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Old 08-12-2018, 04:46 PM #10
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Try using a product like hydrogaurd. Works really well at prevention but won’t eliminate it once started.
I find two days of physan20 then straight to hydrogaurd is how you get them back on track.
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