we are a little bit smarter than plants ... well, not everybody ... nitrogen is a basic element, the source isn't a factor ... nitrogen is nitrogen ... the plants don't know, or care, about the source of nitrogen ... ( a commercial growing friend, with over 40 years' experience, grows the most fantastic plants, I have ever seen in my life, using nothing but Miracle-Grow) :wtf: ... I know the organic treehuggers will get all upset about that, but that's just the way it is ... sift through all the fertilizer advertising propoganda, and buy whatever you prefer ... whatever makes you smile ... and, I am done here happy gardening :smokin: