This block is called Cactus Bloom, originally a Nancy Cabot pattern from 1934. I printed my pattern from my Block Base software and to ensure that the applique would fit into the 4 1/2” block, I printed it at 4.25 instead of 4.5
I ironed my freezer paper templates on to the wrong side of the fabric, then cut around the templates leaving a 1/4” seam allowance, then I turned all the seam allowances under and glued them down, I started by sewing the centre circle down, then the orange flower and finally the leaves.
I carefully cut slits in the back of all the appliqued pieces (so I would be able to remove the freezer paper later) then soaked the completed block in warm water with a little soap (it needs a good hour) this allows you to remove the freezer paper easily (a pair of tweezers can be helpful)
Rinse the block and lay on a towel, which you then roll up to remove excess water, I then leave it there to dry out for an hour or so, then I press it with my iron to get any remaining dampness out
While this isn’t really a traditional method and maybe not for everyone, I am finding that it is giving a good result on some blocks.