So the pot didn't have any drainage but I drilled it a good 15-20 times on the bottom and lower 1/3 of the sides and it does drain when I water it (just a little, I try to water slow). It's been in this pot since I got it in April. And yes the yellowing started a good 4-6 weeks ago before I was feeding anything. It was using the miracle grow nutrient soil at first. It was slow on the bottom before climbing up and now it's everywhere. It's just started affecting the leaves on the buds. Hopefully watching the ph and using this cal-mag might help.