Originally posted by Shadylane
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If you use vermiculite it needs to be about 1-2 cm's deep I would guess.
Also worth bearing in mind that, if you come to pot on, the chillis will have probably sent out roots into the vermiculite from the extra stem that has been buried so just be aware of this when re-potting.
Not sure about depths using sand or whether the chilli will try to root into it (I'd guess it probably would) as I've only read about using sand on the internet. Vermiculite worked for me so I've not seen fit to do anything different.
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