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Rockwool vs Seed starter mix

Posted by mikee77 (My Page) on
Mon, Jan 13, 14 at 22:41

HI guys. I start my garden plants from seed in my basement, and usually use seed starting (soil) mixes with moderate success. I was considering switching to rockwool cubes this year, and was curious to get feedback from others on this. I know success will vary some by plant- I am talking about tomatoes, green beans, peas, garbanzo beans, melons, cucumber, spinach, eggplant and asparagus.

Any opinions/experience with rockwool cubes versus seed starter mixes?

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RE: Rockwool vs Seed starter mix

  • Posted by digdirt 6b-7a North AR (My Page) on
    Wed, Jan 15, 14 at 11:39

with rockwool cubes versus seed starter mixes

I have used both and feel the two are so different that they really can't be compared over all. For hydroponic growing rockwool obviously wins over mixes although there are better than rockwool hydro plugs available too..

But for growing on in soil (non-hydro), mixes are far superior IMO.

Compare germination percentages - only marginally better with mixes but when it comes to transplanting them for growing on, both root development and proper moisture level problems arise with the rockwool when it is surrounded by soil.

These problems can be adjusted for with some plants - those normally grown from transplants like tomatoes and peppers - but if you are also going to be growing things that are normally direct seeded and NOT transplanted - like beans, peas, spinach, cukes and such - then their growth in rockwool is only more stunted after transplanting than it would be if grown in mix.


RE: Rockwool vs Seed starter mix

Thanks for the response. That answers my question.

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