Good question. The only media I can think of (besides soil of course) that will have good wick effect is probably coco coir. Personally I’ve tried only passive hydroponics with clay pebbles and it hasn’t been any miracle grow. Once plant grows bigger together with higher temps it starts to drink a lot and outgrows small reservoir and that is exactly why I’ve moved away from passive hydroponics. Second reason is missing aeration of water (nutrients) which I think also causes much slower growth when compared to classic bubbler. You definitely should have connection to some large reservoir (joined vessels), because I think with traditional wick size of reservoir is enough only for small plants. Be sure to use right material for wick and appropriate size (or more of them) to supply enough moisture when plants are bigger.
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