how deep for indoor bed

12" might be sufficient but 18" would be even better. Make sure it drains well so you don't have standing water in the bottom.
 
if you are going to do it that way, make sure there is a drain to a seperate tray where the water can go and not effect the plants and you can suck it out.
 
12" might be sufficient but 18" would be even better. Make sure it drains well so you don't have standing water in the bottom.

.... exactly, that standing water will ruin everthing! If u put an inch or two of perlite or pebbles in the bottom it will help.
 
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