Hello! Ferlin
I used to have the same problem [slick] . When you selecting Gradient on the top pallete there is "MODE" (close to reverse check box) in wich you can choose from "Color burn, Ovelay, Multiply etc..." i always use gradients in Overlay mode.
If that one didn`t help, try this one:
Make a new Layer, than use transperant gradient (Means one visible and one invisible [slick] ) and than apply every
new gradient on every
new flower on
new Layer.
I hope that helps [stuned] ... good luck Ferlin