Ill have to find the video about a method of growing that use rocks like you did, but they add more layers underneath the rocks. IN total there is 4-5 layers in a pot, and it mimics a aquifier in nature. It is really neat! That is looking healthy, did you decide on no hydro, or is this just a seprate thing your doing along side the hydro?
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The river rocks are mostly quartz crystals, makes me wonder if they're giving off some good frequencies - much more work would make more sense with a perennial I suspect ;) I kept one Pink Apricot in the hydro setup, I feel like it would take a very large system for hydroponic to make sense for me to put the work in the dial in the nutrients. I'll have 2 tents soon too, so dirt planters would be easier to move to another tent than hydro - I'm going to have a variety of bloom times coming up.
I had the water level too low on the hydros for the first two weeks, that's partly why it's stunted I suspect. :D