Greenhouse - Iron Deficiency in Pansies

Iron deficiency is a common problem in growing fall pansies. The following is some information and recommendations.

In pansy, symptoms of iron deficiency are interveinal chlorosis (yellowing) of primarily the youngest leaves, followed by marginal burning in severe cases. The first step in treating iron
deficiency is assuring the substrate pH is within the recommended range. If the media pH is too high, lower it to 5.4 to 5.8 using iron sulfate. Not only will this treatment lower the pH, it will also increase the iron supply in the substrate solution. If further treatment is needed, use a foliar spray of 10% iron chelate at 4 oz per 100 gallons.

Information from "COMMERCIAL PANSY PRODUCTION" by Douglas A. Bailey, Professor, North Carolina State University, Department of Horticultual Science.