What size system are you planning on? Are you married to Kratky or will other methods work?
I've used Fox Farms nutrients in DWC setups for a few years and am happy with the result given the ease of use.
1. Waited one more weak to move my plants outside. a freak storm and cold front basically set me back a month.
2. Probably a Pubescens.
3. Im happy with the varieties i've grow this year. Ill change it up next year as usual but i have found a few keepers.
depending on where he is in SoCal he could potentially grow year round, especially if the plants were in bags that could be moved in the garage for the 1 - 2 days a years where it might matter. There is probably still over 5 months until first frost date.