Is your plant dying, or just looking sickly? There’s a high chance that it is caused by one or more kinds of nutrient Deficiencies. Consult the image to try and figure out which deficiency could be causing the problem, if it is more than one, which is quite possible then it may be harder to tell. If you really don’t have a clue then post a picture up of your plant(s) and perhaps the experts may be able to help.