Flushing after each fertilization.
Our speaker tonight recommended flushing with clean water after each fertilization, especially for sensitive plants. He waters Dend cuthbersonii with RO and MSU fertilizer, then goes on to water other plants. After 20 minutes he comes back to them and gives them a good flush with just pure RO water. He believes the plants absorb all the nutrient in 20 minutes and it becomes a liability after that.