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· Premium Member
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I third their observations - the more light the better for HC.

Also the richer the soil the better - I use black compost for emersed grown HC.

Even so, HC is a slow growing plant and can take weeks to fill in nicely in a setup. There is also usually a delay between when the HC is first planted and when it starts to grow. 3-6 weeks of delay isn't uncommon in my experience before the HC really gets going.
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