i am not sure which ones youre talking about but i do this also for headbands and infant hats. need to make sure you buy the soft hydrangeas- not the plasticy ones. take them apart and i put 2 flowers on top of each one another and stitch to headband and the last stitch i usually add a few seed beeds for color. the key is to group them close together so they look really full. when i do a band of them, they are only about 1/3" of an inch apart, maybe closer. when i do a bunch of them, i cut out a small (2"circle) of felt and then put 24 flowers on it in groups of 2.