My plants look like shit

Buy the right soil. Growing weed with food in it for the first few weeks. And you need to water more often. How do you expect a large plant when you dry it.

Well from diary, it looks like you changed or added soil. Also looks like your plant is hungry. Soil need a good ph rinse as well.

Well, you may have answered your own question... your PH is 5.8 and you're not feeding it. What would happen to YOU if you didn't eat for 3 months? If they're autos, pitch them, if these are photoperiods, you can turn this around... First and foremost, you need to reactivate your root system... get yourself some ReCharge and use it once a week along with some molasses (1/2 tsp ReCharge per gallon and 1 tsp molasses). Make sure your PH levels are between 6.0 and 6.5 with EVERYTHING you give her... Next, you've got to get the PLANT something to eat - get some NPK into her! Go slowly at first since the roots probably aren't doing much at this point. Trim up the dead leaves (even plants like to LOOK good)... She also looks terribly dry... start paying attention to her! Good luck...

Gotta get those temperatures up. You need them in the 20C anything below 15C and you will get extremely slow growth as you have noticed. Also drip irrigation is not the best for soil. You want to have a wet/dry cycle. You want the full pot to dry out before watering not just the top layer. If you want to go with drip irrigation then use 70% coco and 30% perlite.