As far a soil goes, I am using supersoil from walmart (without fertilizer/nute additives. It was the only potting soil they carry that does'nt have added fertilizers or nutes. In the beginning, I thought it was a deficiency so I gave it a good dose of nutes (30-10-10) and within two days her leaves were yellowing and burning so I gave her an emergency flush and transplant. So I don't think it's a nitrogen deficiency.