Geraniums - Leaching Necessary (April 2005)

Higher than 3.0 E.C. on geraniums can cause edge burning. In this case pH was 6.5 but E.C. on leach was 4.5 mmhos/cm. If you are feeding constantly at over 300 ppm nitrogen, then either you leach every time with the fertilizer solution meaning that at least 20% of fertilizer solution leaches out or introduce plain water feeding at every fourth watering.