Hey there Rad... retirement, nice and congrats. I guess you already figured out its more work than actually "working".... just less pay.
I'm right there wit ya! Just gotta KIG brother and your doing fine!
Basement floors of concrete... meh. Seems to me the concrete sucks the life out of plants... my experience. Just need some insulation/vapor barrier or some sealer. I use my 1910 house basement for growing but nothing on the cement floor at all.
Once you get down to a certain level below grade the soil is a constant temperature, which is too low for proper root growth for Cannabis, IMHO .. Comfrey on the other hand seems to be able to handle it.
Currently I'm doing a sort of flood and ....leave the plants soak up the water. I'm very surprised at the amount of water uptake when plants are left to their own devices.
So yeah looking good there on the little ones... they look GREAT.