You should definitely check to see if it's rootbound, which judging from your pictures could be a possibility. Also, get a good handle on your pH if you haven't already, because some of the scorching on the lower leaves makes me think something is locked out. There's a troubleshooting form in my signature - fill that out as best as you can and you should get more tailored recommendations.

Take care. :jointsmile:
Mr. Clandestine Reviewed by Mr. Clandestine on . HELP - Plant dying dis-coloured leaves I started growing my 3rd plant about a month or 2 ago in my conservatory, which get lots of light as it is south facing. Recently I went away for 5 days and decided to cover the soil with stones( stop soil drying up) and give it a good water with some miracle grow plant food, so it would not get thirsty. When I returned my plant went from a lovely healthy looking green plant to a sorry state for a plant, the lower leaves had fallen off and were brown and yellow as in the picture, i have Rating: 5