Yellowing down low is normal for most cultivars. True. I lose about a 3rd of the bottom at flower time. I keep it clean and remove everything. During the last Month or so I use dried Coffee grounds and PH of 6.1...Period. But....Agree, That Pot was a waste. Put a rose in it. Move On to Felt Pots because they Breathe 20 Gal Minimum. I use 30 Gal. If you remove all the useless crap in the Lower 3rd. Buds will get Huge. And good soil is a Key Factor. Listen to the guys here. Some really Good advice.