Potted Plant Special comes with 6.65% Calcium and two forms of Iron chelate for broader pH range. This formula contains Calcium and a very high ratio of nitrogen in nitrate form and is ideal for potted plants or other crops with high calcium requirements and as a general purpose feed for Geraniums and plants that are grown in low light situations. It has an almost neutral pH that will minimize any impact on media pH. Feed at 200 to 400 PPM nitrogen on a constant feed basis depending on crop response.