You are quite right Nicki that it's not practical to withhold fertilizer when you have a large number of plants that bloom at different times. In my case i follow my fertilizing regime regardless of whether the plants are spiking, budding or blooming. As long as the solution is weak I don't have a problem with bud drop. Also I fertilize in the cooler part of the morning to minimize burning. My friend who owns a nursery with a few thousand plants, says in his case it's nigh impossible to to practise 'selective' fertilizing, but he agrees that a few plants with a more delicate bent might be sensitive to fertiser applied while in bud.