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What Medium For Bubbler Setup

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Most likely the rockwool would have been a propagation block, which is a mini rockwool cube used for rooting clones, and then the block is inserted into another medium, such as the expanded clay :) I think propagation blocks can also be used for sprouting and rooting seedlings, too.


You need to use the small rockwoolblocks to transplant into clay because expanded clay isn't the best medium to encourage seedlings/clones to root in. So think of the rockwool blocks as "starter cubes".

Edited by Bubba
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