Some plants will use more or less depending on type, soil condition and nutrient demand. Seedlings do not need to receive any guano. Young tender plants do not need much fertilizer, if any is to be used, use only a dilute liquid guano solution. Ornamental trees and shrubs such as rhododendrons, azaleas, roses and eastern redbud do exceptionally well with an application of guano. After roses are established, more guano can be used.
Roses are heavy feeders and really do good with guano.
All garden vegetables will benefit from the nutrient rich guano. Leafy greens prefer high-nitrogen. Fruiting and budding plants prefer dose of nitrogen and then an application of high-phosphorus guano. High-phosphorus guano can be applied at the same time as the nitrogen grow guano to eliminate one step. You can be credited with saving their lives and helping them to win a whole lot of ribbons in a local rose show.