Flushing or leaching pots
Periodically, it is necessary to "flush" the build up of fertilizer salts from the growing media. To do this, about once a month run plain water through the pot 1 - 3 times when you need to water. This will flush out the build up of salts in your pot. Not flushing, or leaching the pots will cause fertilizer burn which you will see as blackened root tips and browned leaf ends. Follow your regular fertilizing schedule after flushing.