The rainy weather for the last couple of weeks is making it tough for poinsettias to pull up calcium this fall. If you don’t get adequate uptake of calcium then you are likely to see bract edge burn. Many growers are making bi-weekly applications of calcium chloride to get the calcium into the foliage and bracts. The following is a chart from Paul Ecke Ranch on rates of
Click on chart for a larger version in a new window.
Information from the November 13, 2009 edition of the Greenhouse TPM/IPM Bi-Weekly Report from the Central Maryland Research and Education Center, University of Maryland Extension.