I am not sure what/how the aerogarden supports the plugs, like little baskets or if the plugs just fit inside holes with the holes supporting the plugs. I also don't know exactly what size they are from the picture. But I would look at using 1 or 1 1/2 inch rockwool starter cubes. If they are not the exact size there easy to trim down. The rockwool cubes are square in shape but will easily fit into a round hole without any trimming, as long as there a little bigger than the hole
itself. You can usually find sheets of 100 for about $9 (half the cost of the aerogarden plugs).
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